OOG: The delays have caused me to lose track of a few things, such as precisely who saw what when and told whom, but there were indeed 4 creatures in total, and there is just one remaining.
The original creature was split by Pendrake in the middle of the stinking cloud, creating UT1 and UT2. UT1 was split again, producing UT3. UT1 was then killed. UT3 fled after being hit with a magic missile, and Peladus pursued it along the alleyway. UT2 was split by Gillin, making UT4. UT4 was reduced to exactly 0 HP, made a partial withdrawal and started dying. UT2 was caught in the net and splattered. UT4 failed to stabilise and died, becoming visible as it lost shape.
West, though? The fishermen came south across the Square with the net. Do you intend to sweep a new area as you go, or do you mean north?