Canals follow the topography. They turn and wind. When boaters misjudge a turn, they have to put the engine in reverse to avoid "touching" the bank. (Surely not ME!)
Especially when there's an audience, it's tempting to try to rev your way through what's become a multi-point turn.
But there's no fast way out. A 17-tonne boat accelerates slowly. I've learned, if the boat is drifting into alignment—however slowly—just wait; let it drift.