We had this situation before. We don't think its terribly common, but it happened to us. We had a P. irminia sling a while ago, about 2 inches or so. It molted like normal, but when it would pounce its food, it would just release it like it was just playing with it. Come to find out it molted without fangs, or more appropriately lost them in the molting process. Water was enough to sustain it through to its next molt, though we were sure it wouldn't make it. Shortly after molting, with new fangs, it decided that living wasn't fun so it drowned itself in its water cup, which was small enough not to drown. Anyone else ever experienced this kind of behavior? Just weird, you know?