Zoey probably scared the crap outta Patches when she fell off the bed, and her automatic "fight or flight" response kicked in, unfortunately in fight mode. Glad to hear that they're back to getting along, sometimes there is residual emotional damage that can take a while to repair.
"To close your eyes will not ease another's pain." ~ Chinese Proverb
“We must not refuse to see with our eyes what they must endure with their bodies.” ~ Gretchen Wyler