"For him as well," Puck says, with a quirk of his lips, "which may be considered their saving grace, if one is moved by such considerations. On the whole it is better to make no deals with him at all." An infinitesimal pause, after which he adds, "It may also be of some interest that, when so inclined, he can cause one's body to freeze, immobile. I doubt he shall strike against anyone in that manner in the bar proper, but it should be a good deal less noticeable than other harms."