The guy with the gun seemed to decide that the flashy hero who was taunting him made a better target (and maybe he wanted some revenge on having his heist) and went after the flying Booster.
That left Ted to chase after the crook, who was chasing after Booster. And also try and run ahead of the crook ...Ted made a mental note to log more hours in the gym, because this running from where the crowd was to where the bug was? Not as easy as he felt it should have been. The crook was almost fleeter on his feet then he was, and that was just not cool.
When the building The Bug was on the roof of came into sight, Ted slowed down a bit, he had a button he could hit in his glove that would turn the auto piolt on, and bring the Bug to him, but it was going to take a few minutes . "Hey!" He couldn't tell Booster to keep distract the guy, 'cause that would tip the crook off. So Ted settled for; "Just keep doing what your doing!" and hope that worked.
He also hoped the auto pilot on The Bug worked ... be really embarrassing if the thing crashed.