Round 781
Rusty emerges at 45N55E and breathes at Quickblob, who is at 40N10E5Z. Quickblob dodges (rolled 24 Ref save), taking 6 points of acid damage. Rusty can breathe again in round 784. Quickblob has 116 HP remaining.
Quickblob zips over to 40N40E5Z and smacks Rusty (rolled 29) for 6 points of damage. Rusty has 71 HP remaining.
Do you want to time compress the cycle of diving, coming up to breathe, and diving again? When Rusty dives, he can bite before taking a 5-foot step underground.