Are you planning to watch them in the shed 24/7 for next 3-4 days??? If they look as though they are going to lock on, box or bite , then you will need to intervene, but if it is just chasing or a bit of fur pulling, then best to let them sort it out themselves. Mine are still doing a bit of fur pulling after 5 days together, and I'm still watching them 95% of the time.