Had several instances where pressing 4 to detonate owl did nothing. I could only explode the owl by running it into a wall or directly into someone.
example match 12738685 (I'm not good with him. don't criticize me too much)
turns out that it's a UI bug. If you change the keybind it will say to press whatever key again to explode and space to cancel, but it's actually just space to explode