Hero with fireorb deal more damage sometimes.
proceed as follows:
1.Let hero-A carry [Orb of Fire], and attack hero-B until deal 300+ damage.
2.After the debuff(reduce healing) ends, let hero-B carry some hp-regeneration items([Ring of Regeneration] or [Health Stone]).
3.Wait until hero-B’s hp is full.
4.Let hero-A attack hero-B again.
First hit will deal more damage.
the more hp-regeneration item provides regeneration, the more hero-B takes damage.