This applies to Erebus at least. When I use Bite and click on a target, I expect one of three things to happen:
- Erebus immediately performs a Bite
- Erebus moves to range and performs a Bite
- I see an error message telling why a Bite was not possible
However, occasionally nothing happens, even though I'm standing right next to the target demigod. I am not sure how to reproduce this, but it has occurred in several games against the AI. When the problem occurs, repeated attempts at Bite are not any more successful. Moving does not help the situation. Using other abilities might, but I haven't conducted any conclusive tests to determine that.
I think I may have seen this once with Bat Swarm too, but mostly it's just with Bite.