Imps get summoned upon immunity:
However, they are moving towards the target instead of casting when in range same as gargoyle does on pwow for some reason.
On top of that they are moving while casting same as gargoyle does when summoned which is not legitimate:
Imps don't attack players anymore. Only way you can make them attack is with meele hitting a target.
I will do some more tests when I find time, feel free to add anything.