Easy enough to ignore all that, considering everyone has that "go beyond your limits!!" Mentality in this setting and a speedster WOULD likely be familiar with that typical terrain issue. I mean we're fighting the justice leagues Flash, Green Arrow, and Hawk Girl. (Waiting on the boxing glove arrow btw!) 

But where's the thrill? The dramatic conclusion as the speedster fails to see that loose rock trip them up. Where's the danger in simply escaping. 

So far its just the Archer with any kind of backbone.

Or perhaps his escape is a simple Iida scene clone, where he comes back with REAL heroes? Oh please tell me that's what happens. Wouldn't be a hero academia RP without some repeated scenes.