Erectopus vs lion

Erectopus is an allosauruid. At 10 feet long and 450 pounds. and its 1 inch teeth and 4 inch claws. This will turn the lion into a pussy cat.

Taking on predators half it's size. And those huge herbivores are fallen in large prides and the lions will often fail.

They are the same size though the allosaurid will look dimensionly bigger so it would be more intimidating. How would they fight?

the allo charges then sidesteps and bites the side of the lion who roars in pain. The allo then starts slashing through the fur and flesh.

The lion is going to keep its distance while trying to pinpoint a weakness of the allosauroid. Despite the size advantage Erectopus has, that's basically the only advantage it has here.

Anyway, Erectopus was probably under 200kg.

Allain estimated the mass at ~200 kilograms but noted Erectopus as a "dimunitive, gracile carnosaur"

The lion we should use here is  populations in Rhodesia, Kalahari and Kruger Park averaging around 190 kg.

Allosaurs in general weren't very good at taking on small prey. A lion shorter overall, is going to be a difficult target for Erectopus to grab with its jaws. Being an allosauroid, it's jaws don't expend a great deal of pressure. Yes, they possess serrated teeth but what good does that do when you're facing an opponent that isn't sticking around to get attacked?

Erectopus is more agile and can catch up with the lion then bite the lion's side and tear of a chunk of flesh while holding on to him with big, powerful arms and large claws.  The lion would try to shake free but it would only make things worse by pushing the claws deeper inside and making the teeth cut more and more. Then it will stop biting and unhinge its jaw and bring it's upper maxilma down with 500 to 1000 pounds if force and take a Incredible chunk of flesh out and then dose it again but this time on the spine, it breaks the spine and cripples the lion. Erectopus roars, he is tbd new king of the jungle and begins eating the fallen adversary. He needs to eat to refuel his energy and help him heal his bad injuries.