Boroge turns, flattens itself into the water and swims away, somewhat more quickly than it would wallow. The hump of its back shows above the waterline (and you can see i've added a 'glow' to that) which the party can see, but which will modify the chance to hit (particular issue for Enrico, as now the hydra is a bit far for daggers). It moves 5 hexes altogether.
The party's move is shown as before. Feel free to take action.
I can save a little time if I put the next update here: