Round 3
[Sounds like Marcus if 'fighting defensively']
Marcus stays alert, but slips out a dagger and hurls it at the towering mass. It seems to bounce off the watery surface. He is unable to observer the effect well, though, as this time one of the wet tendrils slams into him, sending him breifly off his feet, and, if possible, soaking him even more. (10 pts dmg) As he rolls back to his feet, he heaves a great sigh of relief. An arrow has again flown from Octar bow, straight and true. It penetrates the column of water, flying out the other side. At that, the whole mass collapses in a huge splash, soaking Tullius and Ehldannis as they approach.
The water rushes back into the river and the corridor is quiet.
We'll assume Ehldannis didn't yet cast his shocking grasp spell.