Cholodny moves toward the creature, but with the water slowing him down, he can't quite get close enough to hit him with his Glaive. (He's just 5' short).
Burian lets an arrow lose but it flys just wide. Brata does the same with his crossbow and misses as well (8+2=10). Ivan's bowshot is more successful, however, and he sinks a second arrow into the Vodyanoi's chest. The creature make's a short low-pitched sound that seems to be a scream, but doesn't fall.
Misha moves to the side and forward, and fires a spear from about 10 feat away, but this two flies over the man and into the river.
Stanislave was able to swing once as the Vodyanoi retreated (Attack of Opportunity: 6+7=13 Miss). Then he manages to get into melee range and swings (16+7=23 Hit!; dmg 7 points). Again the monster growls but doesn't fall.
Round 2
The Vodyanoi withdraws from Stanislava's mighty blade (avoiding an attack of opportunity). The creature moves in the water far faster than humans are able to, and is now 40' away from the Stanislava and is completely submerged, though barely visable.
Conditions:
Misha, Stanislava, Cholodny, Brata, and Burian: unhurt;
Ivan: 3 points of damage (23/26);
Vodyanoi: 25 points of damage