Thanks! So crazy.
Is it possible Leo is reacting to the unexpected visit of the kitty we had for over four years and rehomed four weeks ago, but our daughter brought him over on Sunday? Isaiah hissed at Leo, and Leo didn't react when Isaiah did that. Then our daughter comes in for a quick 30 min lunch most work days.... and I'm sure Leo smells him on her. Leo & Isaiah were good buddies, so the visit reminded him his friend is not there like before. IDK. Maybe out of sight, out of their kitty mind.