How do frogs kill their prey?

[DVirginiana]

I've never fed live rodents/fish to mine, but now I'm curious; When they get larger live prey, will they wait until it's either dead or very weak to swallow it completely?
Mine will often hold worms in her mouth/throat for a bit before actually swallowing. Not sure if that's actually a behavior to weaken the prey, or if it's just something she does.

[Hypnotic]

When I fed my adult female live, she always bit down untill the prey stopped moving. I think it is a behaviour to weaken the prey, in the wild they must have some pretty epic struggles.