This is what I do, does not mean you should, just what I do. When one piips and comes out of the egg, I wait 24 hours, if no more pip or come out, I immediately start pipping the eggs. You MUST be careful when you do this, if you snip a blood vessel they will bleed to death ( I suspect that is what happened to your friend) Read Marzeks book on boas and pythons, it discusses the technique and shows how to do it.
I only do it if the others have not hatched out, it is not worth it to me to lose them cause they couldnt get out of hte egg. I had to do it with 3 or 4 this year, had I left them in the egg they would have died.
Good luck!
B
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Cheers
Lateralis
"I would rather be precisely wrong than approximately right"
Marion "Doc" Ford