Hunter takes the phaser, and gives it to Hermione, when he notices that Jim is now clutching the knife against his chest.

"Jim?" He calls out softly.

Then Jim moves as if he is heading towards the door. Hunter had followed him, and was just barely able to step back when Jim swings around and attacks with that knife. Luckily for him, one of the charms on his vest is a Protego spell, which protects him from getting cut.

Hermione jumps up, quickly casting a Protego spell on the door that Jim is approaching, so he can not leave. She decides against casting an Accio spell on the knife, since Jim is gripping the knife too tightly right now.

"Jim!" Hunter tries again, trying to reach him.