Beating a champ then lagging out

So I'm in alliance was and I went to go fight red skull,( for a little context I joined the battle a little late so all my champs were full health ) as you could imagine I had no trouble beating red skull but after I got the to the victory screen I lagged out,( this glitch has happened to be a few times before) when this happens you have to restart the game and when I came back my corvus was at half Heath even though I only lost about 5% health and red skull was at full, i feel that it's understandable to not have me kill red skull because I lagged out but whytake half of my health. I think this should be changed.