^I'm unsure about how the T-Rex is standing on the edge of that rock jutting above the water. It looks like he might be trying to keep his balance as the asteroid is blazing through the sky.
Also, is the team physically interacting with the time period? They would be still close to the blast. Really, I think it doesn't matter how close they are to the asteroid trailing in the sky. Either way, they are fucked unless they are out of phase, or had their craft programmed to travel back to their time just before the blast arrives at their location.
My point is both are good. I don't care how close those guys are