Heal injured pet macro

I use a vet macro that is very useful for running with multiple pets at the same time. It goes like this:
1. Bandies,
2. Wait for Target
3. Target severely injured follower.
It works great.
I tried to do the same thing with magic:
1. Greater Heal
2. Wait for Target
3. Target severely injured follower.

In this case instead of a heal I get a targeting cursor. What am I doing wrong here?