Caz didn't visibly startle or jump at the broom, though he did internally. This was definitely weird territory for him, and at the very least, the discomfort on his face was obvious.

"Confidence? Hn~" He normally had that in spades- well okay, a bit too much of that -but he was still a bit preoccupied with the whole 'magical broom trust' thing. A moment after staring at the broom, and he finally slung his leg over. That was probably the most confirmation to being ready as he was gonna give.