4.0.1 Druid Macro Help Needed

[Shamago]

if you are out of combat, but your tank is in combat and there's a spell to interrupt, you might need it (I've already used it this way a few times).

You can simplify the statement as:

/cast [combat][modifierhift] Skull Bash(Cat Form);Prowl

Since it's basically a fall-through.