I sit tight and wait for a shot. A quartering tward shot is a poor percentage shot IMO. Can I stick it, probably but the marging of error is too small.
If it's meant to be the shot will develope, otherwise the bull wins the right to be hunted again next year.
I look at hunting as a game of match wits between myself and the game. If the shot isn't there, It isn't there. A lot can go wrong trying to force a shot that dosen't exist.