I found a Bug which is highly repeatable.
If the Torchbearer gets very close to enemys his auto attack (throwing fire/ice balls) dont hits at all/ it makes no damage.
This is very obvious vs Minotaur creeps: The missle flighs over the creep makes an sharp curve and lands on the ground behind the creatures back.
For me it seems like the missle is just not hitting him from an gamephysic point of view and so it does no damage.
But this looks very exploitable for any melee demigod.
Hope I told you something new 