It should be a simple feat to cross for some ninja-trained teens, but...

It happens as they're just about three quarters of the way across. Leo looks back, a stupid impulse to see if the tiles behind them are starting to move apart again, when his foot catches a gap and he pitches forward, tumbling away from Donnie and sliding into one of the wider gaps.

"Gah!"

Thankfully, the magma is still well below his dangling feet. Unthankfully, the tiles are still moving, and the gap between the tile Leo is clinging to and the oncoming ones is rapidly closing.