Skender stabs it in the head after dropping down from a height, between two shell/armour pieces...though, admittedly, not sure about the mechanics of shapeshifting with objects on/equipped...should I change that?

Luka wears bad@$$ gauntlets...she would 't have been able to punch an armoured creature without them. Those, and her whip are her main weapon...

Admittedly, as usual, I ain't the greatest in moderation...or writing, in general...