Cursed monkeys are tougher than I thought. Maybe it's the extra head. Let's try this again!

Seeing Karan rush in and smash the monkey that had clawed him, Thorik turns to help the guard next to him.
He will attack M1, unless it dies before his action, in which case he'll attack M3. If they both fall, he will 5 foot step back towards the wagon.

Spoiler: Actions
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HP: 65/66
AC: 18
power attack: -1 attack for +2 dmg

Fort save against M1's attack: (1d20+10)[14]

Full round action: Full attack on either M1 or M3.
1st attack=(1d20+10)[13]; damage=(1d10+9)[10] magic slash
2nd attack=(1d20+5)[10]; damage=(1d10+9)[12] magic slash