The floor crumbled away and the cleric (of Man Pac) fell into the underground channel, moving swiftly west.
A fighter, keeping watch, bellowed loudly, causing something to stir on a channel bridge to the east.
The assassin threw a rope and rolled a 1 and fell in, too.
("Please do not penalize your players with 'fumbles' and 'critical misses'." There's actually an RPG book somewhere that says that. People play it.)
The druid and the other fighter threw a rope to the cleric. The cleric caught it, they pulled, the current was swift, they fell in, too.
The wizard cast Animate Rope and tethered the floating assassin to the channel floor.
The assassin threw one end of a rope at the dry fighter.
The dry fighter caught it and tried to anchor it to a corner of masonry.
Passing int he water, the druid grabbed hold of the tethered assassin.
The rope that the druid held still had the cleric on the other end.
The Rolangian 2-headed ogre attacked the dry fighter, who dropped his rope.
The wizard used animate rope to tie the dropped rope around the ogre's legs.
The ogre rolled poorly, and fell into the channel.
It used one pair of eyes to direct an arm to wrap around the anchored assassin's neck, it used the other to direct a spell at the fighter.
Straining against the swift pull of the channel, and the momentum of a cleric holding a rope attached to a fighter and a druid who had grabbed an assassin who had been grabbed by a two-headed ogre, the anchoring rope gave way.
The druid turned into an octopus and tried to rip a head off the ogre, and throw it into the water.
And, just like that, now I love Mondays.