See screenshot - Mystic Mogg (the chap in the black robe) targeted the war dog with Fires. As per usual, the camera tracked with the fireball. However, rather than impacting the dog, it carried on through the "floor" and into blackness. It was possible to fetch the camera back to Mogg by tapping on his pic, but as far as the game was concerned it was still waiting for the fireball to impact and no other action was possible. This has happened before on other maps - I assume it has to do with the angle of fire.