Q:How can I kill the t-rex I don't have the shotgun?
A1:
Just keep shooting it with the pistols and when it does it's rage attack adrenaline dodge and shoot it in the head. It should hit the wall or spikes and hurt itself. Keep going till it dies.
A2:
Shoot it with you pistols to make it angry and run at u, then dodge and shoot it on the head on impact mode to make it bang its head, continue and it will die in no time. -Answer by:Omicove
I sent this answer to the wrong question, damn ok ! shoot the hell out of them asap! piss one off he'll charge".so dodge him "shoot'em in the head,which will stun him" get in a good position in front,so you can grapple his sheild away from him,fill him full of lead, then hit the next one same way, now it's up to you ,which one to kill first,take your pick ! have fun,, glad I could be of some help.. fuel4u