The halberd stabs into the incoming zombie but appears to have no effect. Teach drags the point free then spins the axe blade round, attempting to decapitated the creature.
Spoiler
Previous attack missed. Attack again (with guidance this time):
(1d20+5)[13]
Edit: forgot the guidance - +1 to the above
Damage (slashing) if hit:
(1d10+4)[12]