The following are comments made on this video link]:
Person A:
Anyone know if the dude actually lost any digits? A fish that big looks like it could take off with your arm if it wanted to.
Person B:
I don't see any spurting blood when his hand flashes back into frame so he's probably fine.
What does Person B meant when he says when his hand flashes back into frame? I understand that flash here means to move very quickly according to OALD, but what about into frame? Does frame here talking about the body?