Get one of your tribe mates to go give it a hug and ‘accidentally’ knock him/her out instead of the mega. Then while the mega is distracted on eating your tribemate, (by this stage of the process your friend is probably screaming at you) just slowly sneak away
One night there was a survivor who went on a journey with his pets, a trike, tek parasaur, and carbonemys. All pretty high level. Then a monster lurking in the shadows was about to change their life forever. A Megalosaurus was carnivorous and nocturnal, meaning they only came out looking for prey at night. It attacked the tek parasaur first. It killed it and killed the trike next. The last two standing were the carbo and the survivor. The carbo went charging in with determination, but it wasn't enough. The survivors last creature collapsed and all that was left of the squad was the weak survivor. He went fighting anyway and was killed shortly after.
Lesson learned: Don't bring all of your creatures out at night.
Okay so I got drunk, walked away from my PS4, my friend and his Argy got eaten by one of these. I come back, save his stuff and his saddle after my bird got eaten. We came back, tamed it only for it to run out of stamina on the way home and drowned.