I don't think that is normal. I hope other breeders can chime in, but in my experience tail-wrapping courtship and spurring is normal and none of that leads to blood loss. Female snakes don't cycle like humans do either, so she wouldn't be bleeding naturally. I would fear that there was a feeding or defensive response and someone was nipped. If that is in fact the case, you are lucky you still have both of them, since sometimes accidents lead to cannibalism. I would keep an eye on them if this has happened before, next time you reintroduce them.
Then again, as far as different species, perhaps in some matings there is combat or 'grabbing' while breeding. I've never had it happen myself. I hope you can get a better response from one of the bigger breeders!
Good luck!
-----
Steph S.
Boas...
1.1 Albino boas (Loki & Hope)
1.4 07 Het. albino boas (Petty & Lady,Sierra,Madeline,Lola)
0.1 Reverse stripe poss. het albino (Cookie)
0.1 Salmon/hypo (Scarlet)
0.1 Anery poss. het snow (Missy)
1.0 Anery (Reno)
0.1 DH Sunglow (Bonnie)
1.0 Het. Anery (Guy)
0.3 Normals (Ophelia, Sasha, & Lulu)
1.1 Surinames (Solomon & Surreal)
1.2 Hogg Isles (Mr.Orange & Peaches, Apricot)
0.0.1 Central American (Sassy)
0.1 Emerald Tree boa (Jade)
1.0 ATB (Satan... seriously!)
Pythons...
2.1 GTPs (B., Monty & Jewel)
0.0.3 BPs (MJ, Precious, Houdini)
1.1 Carpet Pythons (Jackson & Charlotte)
0.1 Blood python (Akaia)
Misc.
1.1 Mandarin Ratsnakes (Jack & Jill)
1.0 Boxer/Pitt Mutt (Tyson)

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