When the one cat's blood was dripping through the ceiling on Regine below, it wasn't enough to saturate and drip through the ancient stone castle floor above. Per the script, "It was nothing." Indeed.
The characters find a "dead" cat bleeding on spikes in an upstairs room. Yet the cat is very noticeably breathing, its chest moving up and down.
When blood drips from the ceiling on Regine's arm, she and Nancy just sit there looking at it, rather than wash it off.