The sword Peridot summoned moments ago disappears just as quickly. Trying to stab the snake when the others are trying to build a wall against it seems kind of counter-intuitive for one thing. For another, the fact that the sword doesn't just outright kill the snake doesn't really do her primal sense of fear any favors.

What follows is not at all a conscious decision; Peridot has always been kind of impulsive in high stress situations, but the subtler mental changes that her time in service to a wyld fae have caused have really only made that worse. Her fight or flight instincts are on a hair trigger, so when the snake continues to strike, and no sensible contribution springs to her mind? She goes full berserk beast-mode and turns into a dragon, crouching low and screeching at it defiantly, on the defensive and ready to spring to intercept if it happens to break through.