Shiver takes her blade in both hands and makes a huge, rage empowered, roundhouse "swing for the fences" blow with it, aiming at the bodyygaurds, and if Snigbat happens to "accidentally" be in its path, then thats her fault, not Shivers.

Spoiler: ooc
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(1d20+17)[33] attack & (2d6+18)[25] damage


Note that Shiver is not aiming for Snigbat but not, not aiming for her either, its pure luck (good or bad) if she happens to be in the way, trying to get at the bodyguard...your ruling.