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a large brown bear male isn't a force to be reckoned with. here are a few accounts demonstrating the strength of the bear...
"I observed the incident from the road on the west sideof the Yellowstone River near the outlet of YellowstoneLake (elevation 2,371 m) on the morning of 23 September2000. I was observing a grizzly bear with 2 cubs-ofthe-year that were digging for pocket gophers (Thomomystalpoides) in a meadow 300–400 m from the Lake Lodge.This family group had been frequenting the area throughoutthe summer. At approximately 1200 hours, the bearsbegan walking northeast along the shore of Yellowstone Lake toward the Yellowstone River outlet at Fishing Bridge. At approximately 1300, the bears emerged onto the road at Fishing Bridge Junction and crossed to the north side. The bears continued walking north in a direction that would have taken them past a young adult bull bison lying under a tree 15 meters from the road. The bison stood up abruptly when the bears were approximately 5 meters away. When the bison stood up, the bears appeared startled. The adult female, then the cubs, stood up on their hind legs and looked at the bison. The bison stood in an alert posture with his tail raised and head down.
After a few seconds, the adult bear lunged toward the bison.
The bison immediately turned away and began trotting east, up slope along a bench directly above the road heading toward Fishing Bridge. The adult bear loped after the bison at less than full speed.
I drove east along the road, observing the movement of the bears and bison approximately 15 meters away. After trotting about 50 m, the bison broke into a full run. The adult bear then chased the bison at full speed. At the crest of the hill above the Yellowstone River, the bear swiped its paw across the hindquarters of the bison, knocking the bison’s back legs out from under it. The bison began to slide down the steep embankment of the hill on its back. After striking a tree with considerable force on its front quarters, the inverted bison continued to slide toward a pedestrian boardwalk at the base of the hill. The grizzly leaped onto the stomach of the inverted bison and skidded down the hill on top of it while attempting to bite at the bison’s neck. The bear and bison came to a stop at the base of the hill on the pedestrian boardwalk. The bear continued to bite and pull at the bison’s neck while the bison tried to get to its feet. The bison managed to stand and struggled to remain standing, but the bear continued to pull the bison back down to the ground. When the bison did stand, its hind legs buckled under its own weight. The bear took advantage of this and jumped onto the back of the bison, biting and clawing at its back, inflicting a number of bite and claw wounds around the bison’s hump and lower back. With a quick head motion, the bull managed to free itself from the bear and stand up a second time. At this time, I observed that the bison’s left front leg was broken. This injury may have occurred when the bison slammed into the tree while sliding down the steep hill. The bison continued attempts to stand and fought off the bear with its head and horns for several minutes. The bear stood up on its hind legs and swiped at the bull’s head with its paws. The bison reacted by rearing up, which caused it to slide backward into a ditch adjacent to the Fishing Bridge boardwalk. Being in the ditch appeared to put the bison in a better position to fend off the bear with its head and horns.
At this time the 2 cubs, which had been observing their mother from on top of the hill, came down and reunited with her near the bison. The bison continued to struggle to keep up-right and bled profusely from its back and hindquarters. The adult bear attacked the bison several more times, but the bison was able to use its head and horns to repel the attacks. The cubs did not participate in these attacks but remained nearby. On 5 occasions the bears left the area and were no longer visible to me, then came back and the adult attacked the bull again, but was unable to kill it. The interval between attacks increased from approximately 5 minutes to several hours between return visits.
At approximately 1800 the bears left and did not return, enabling me to investigate the bison in the ditch. The bison was startled upon my approach and attempted to climb out of the ditch. It fell down and was unable to pull itself out of the mud. Due to the proximity of the bison to the main road and concerns for the safety of visitors and a construction crew working on the road bridge adjacent to the attack site, park management decided to dispatch the bison and move the carcass. After shooting the bison, the carcass was moved 0.9 km away to a location remote from public use areas. Managers hoped that the bear family group would follow the scent trail to where the carcass was disposed and scavenge the remains."
assumng this is a big russian male brown bear ~(380kg) things get worse for the raptor.
their jaws are very impressive
at ~200kg U. arctos bit with 1400N at the canines
and, besides this i think the austroraptor wouole have great difficulty. especally considering the fact that the bears fur and fat content would prove tough for the theropo to get through (tigers have issues with this)
taking into account that Austroraptor doesn't have a very robust skull -- but instead a thinner, elongated skull and reduced length of the forelimbs,(A bizarre Cretaceous theropod dinosaur from Patagonia and the evolution of Gondwanan dromaeosaurids" (novas, pol 2009)) i could see it struggling immensly with a similarly sized bear.
