I'm guessing it's something along the lines of the angle he was going at was steep enough that if the bridge thing wasn't there he'd have been going up for that section of space but shallow enough that instead of bouncing off it he sorta grazed it and kept going
(I'm half asleep so taking my guess at face value is maybe not best idea)
(I'm half asleep so taking my guess at face value is maybe not best idea)