Ten minutes was far too long, but it was what they were dealing with. Reed frowned, particularly when he overheard the bit about teenagers being in the way of the Hulk. There wasn't enough time to wait for the Quinjet and then fly out to the Hulk-- not if they wanted to save the lives of those teenagers. Reed stretched out to pop his head back into the tent to peering in at Sue, already pulling his jacket, tie and dress shirt off to reveal the signature Fantastic Four uniform of unstable molecules beneath.
"Susan, I need to go after him." He said, leaving the question of 'are you coming?' unsaid. Reed needed to go for Bruce- and if Sue wanted to join him... well this was just the kind of situation that they seemed to find themselves in on a regular basis. Besides, if Susan Richards decided she was going to do something; Reed had learned many years ago that it was best not to argue.
Leaving his suit and tie behind, Reed stretched his legs out, growing taller and taller and taller until he was easily twice as tall as the Hulk (albeit much thinner). Each step covered a considerable amount of ground and it wouldn't be long before Reed caught up with him and could at least help to keep civilians out of his way.