One time I was walking around a valley on the ragnarok map and I saw two Allosaurus glitched inside of each other and one tried to kill me but could not move around and was just vacantly staring at me while I stood taunting the thing and then another allosaurus came up and killed me and I was just stunned. Allosaurus normally have this glitch when wild 'cause they spawn in packs and normally two are glitched inside each other and some other allosaurus comes up and kills you. Good luck taming allosaurus! P.S. You can get two if you knock both of 'em out but I just do the kill command on one.
When three or more allos meet up, the highest level becomes an alpha. He will be the one with orange glowing cloud on his back. Reducing the pack to only 2 dinos will remove alpha status from the highest level allo. This means it is usually easier to kill the weakest in the pack first and then the fight will be much easier. Multiple alphas can be created if a large group of allos form. However that are not invincible. Personally saw a group of 15 Wild allos with 5 of them being alphas get wrecked by a Lvl 80 giga. So even if you could somehow tame all 15, you would be far from invincible. A good step up from a carno, but they stand no chance against similarly leveled Rex or giga.