Tarbosaurus

You and your friends in the iykyk era, walking through the forest, ends up in an open field, like the size of a football field, like no nothing, just flat grass, no trees, then you hear and see a Tarbosaurus behind you guys, you all turn around and it roars, then you guys have no choice, but to run as fast as you can to the other side, but then it's faster than you expected, it captures one of your friends and pins them down with it's feet, you all stop and look back, what do you do