My only question is would you be able to attack someone while draining from them? i cant really say whether its a yes for me or not because of that factor :/
1. No, you can't hit while draining as you are unable to use melee weapons / hoe 2. You can stop the drain by killing the Hemomancer, or if he stops draining
LOL imagine invis trolling with this kit it would be so fun. Also u can make A upgrade: it can spread to nearby 2 players and like drain the health from them but for every person u drain from + 1 second of cd (it can be changed depending on the 'stage' of the hemkmancer)