Vispilius hesitated a moment in confusion-
"You don't know what your spell is... what? Never mind, we've outstayed our welcome already, hang on!..."
With that and a thought the branch accelerates and lifts away from the water, and away from the knight, down the river in the direction nearest their sodales. Over his shoulder, he shouts back at the charging fae -
"We were not here to cross, nor to trespass, just passing along the river's course! We return down the river, from whence we came!"
Perhaps a vain hope, but he had heard that sometimes logic was narrowly defined when it came to curses and the like.
Once the new course is set, he has the freedom to cast the same spell again at the approaching crows, but will only if they seem to still be interested in pursuit. Either way, he looks back to the knight, to see if the charger is leaving the water to join them in flight...
(If it seems the knight cannot fly, no need to lead it to the others on the ground, V will just gain more altitude and move away. If the knight can fly... that's a different problem...)