Someone could indeed. Even if Squall wasn't nearly as good at lassoing things as he was simply killing things, he was going to let that stop him. The dinosaur had to be stopped one way or the other and this was going to be the best shot they had.

Fortunately enough, he managed to get the lasso around the dinosaur on his first try, going for the much more logical choice of the thing's head. At least that way they could try to keep it from thrashing around too much, or so he hoped.