I had the exact same thing happen to me the other night, had just told a friend that arvo that our woma had never even tried to bite us, then I went and grabbed him just before I fed him (With rat-smelling hands, stupid, stupid stupid!!!) and he tagged me on the tip of my index finger, threw coils around my wrist and started to squeeze a bit.
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I left it for a while, thinking he would catch on soon that I wasn't really food.... 5 minutes later I thought maybe I'll give him a little encouragement to let go, by running his head under cold water. All that did was make him decide to eat me faster!
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As soon as the water hit him, he started swallowing! he got all the way down to my hand, then kinda looked like "Ah... What do I do now? I know, I'll just keep chewing, surely there'll be some way to get it in."
I eventually had to submerge the poor bugger in a sink of water to get him to let go. But he ate his rat no worries afterwards, so no harm done!
Also, rather disappointingly, there was not much blood at all! But that's my first snake bite out the way, and now I know it's not particularly painful then I won't flinch too much if/when it happens again.