so here's the order of events, given that this takes place in an adventure combat encounter.
the initiative/turn order:
enemy 1
cat 1
cat 2
enemy 1: hisses at cat 2. cat 2 gets -2d on rolls.
cat 1: goes before cat 2 and uses call to action to give allies +1d to rolls.
cat 2: no longer has the hiss debuff, and now instead has the call to action buff.
so it just looks like buffs can override debuffs somehow? it's weird!