Arsenne moves to the entrance and peers inside, and if he sees anything that might be attempting to cause harm to Kaen, then he attacks it with his Glaive.
If he strikes, he calls out: "Hunting hornet, SLASH" while striking with his Glaive.
Spoiler: Crunch, just in case.Perception +8
Risky strike (power attack) [roll]d20+5[/roll]
Damage [roll]d10+9[/roll]
Note: His feat, Combat Maneuvers may prove useful.