The sudden jetpack surprises Hal long enough for Jaime to slip out of his grasp, but he doesn't miss a beat in dropping his construct and gearing up to take off into the air when Wally's words give him pause. He does mostly trust Wally's judgement, but he's not sure how much influence Jaime has over him.

"Then explain to me what he's doing here?! Our ground rules were don't break the law and I warned him last week to stay away from you."

He doesn't pay Jaime's words much attention. Listing credentials that they can't check is pointless and while Booster could have done it, he also wasn't the most professional hero and Ted's death had to have hit him the hardest. Who knows what a grieving man could do?