Grillin pauses and considers his actions, waiting for an appropriate moment, muttering word of gibberish under his breath.
Spoiler: actions
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Grillin will delay until everyone else goes or the two Swords are dead, whichever comes first.
If both Swords are alive, will cast Slow DC 20.
If either (or both) are dead, will dismiss the warding and cast Split Orb of Acid at the Worm caller (1) and the remaining Sword (2, unless dead of course, then extra love for Worm Caller)
Ranged Touch attack 1 (1d20+10)[13]
damage (11d6)[35]acid
Ranged Touch attack 2 (1d20+10)[20]
damage (11d6)[33]acid