On mission 14 when you're running away from the Turnbull's bus, Swan just stops when I gain control, and won't run. I've tried pushing x and triangle incase theres something in my way, but there isn't. I'm holding L2 and I don't know what I'm doing wrong. A couple times I've jumped through the bus, but I still can't run after I do that. Does anyone know how to help me?