Then the unexpected happened.
The instant Henrys had passed the end of the chain through the knot, Pat, possessed by some Hibernian notion that now all was fast, let go of the bit.

Jenny's head at once went under, and the end of the logging chain glided over the ice and fell plump in the hole.
Immediately all was confusion.

Jenny kicked and struggled, churning the water, throwing it about, kicking out in every direction.

Once a horse's head dips strongly, the game is over.

No animal drowns more quickly.