Heroes lose initiative.

The "tardigrade" attempts to swat AGR-01 out of the sky with a brutal tsunami of river water but misses horribly.

The heroes working together like a well-oiled machine retaliate:
Fury fills the water with dirt, slowing the monster and converting much of it to mud. Bolt then blasts it with roaring gouts of flame, damaging the mud monster and hardening it in place. AGR-01 finally smashes a huge chunk out of it and it reels backwards, unbalanced and partially broken.

There is no cry of pain or look of confusion, so their instincts tell the heroes that this "monster" may be controlled water, not an entity of its own.

Round 4 actions and rolls?