I worked at McD’s in the late 70”s while in college. One of the guys slipped and sunk his hand into the deep fryer halfway up to his elbow. I was standing right next to him. Fortunately the big ice maker was only two steps away. As quick as he pulled his arm out, I grabbed his elbow with one hand, opened the ice bin door with the other and shoved his arm right into the ice. It all happened in fractions of seconds. Surprised us both that no damage was done.
Must have had just enough sweat on his arm to form a short-lived vapor barrier, like what is claimed in “fire walking”.