Proposal: option to block abilities of teammates on your hero

[BORO Croat Blade]

Hi All,
I am writing this as a consequence of one game. In that game, I was in team with player called Vendetta who picked Bane. From very beggining player was abusive to rest of team, calling us noobs and idiots but that was lesser problem. He deliberately casted Nightmare abilities on us, and although it sometimes can be beneficial is someone atacks you, hi did that deliberately so our team would lose, that is he casted it every time in worse possible moment. There is no doubt about it cause he openedly mocked us about that. Worse part is we were close to victory, nailing all their towers except last before baracks, so we were able to manage 4 vs 5, but were not able to handle 4 vs 6 cause he casted on our players who were escaping with low health and were easily killed therefore acting as oponents 6th player. Of course we had reported him (at least i did) but I still feel sorry we did not had some option to block casting his all abilities on me (for balancing reason both positive and negative).
Such option would give us at least fighting chance (and would help when teammate unintentionaly cast spels on you in wrong moment.. as for example winter wywern) so guys send me your opinions, do you agree that developers should introduce that option too?
Thanks all for any contribution, it will be welcome :)

[Duchess Minty]

Disabling ally help is already a thing, you would know this if you bothered to explore the ingame options.

http://images.akamai.steamusercontent.com/ugc/1099167284619277095/A6DEB950191D1D225B5AE44F01E896B48451D844/

[R4bb1T]

Do you mean the Disable Help option that already exist?

[BORO Croat Blade]

Well, honestly I was not sure if that disables Nightmare ability too cause it does not help dierctly but actualy hurts player at beggining, however if it does, thanks for quick reply :)

[SUPER IDOL DE XIAO RONG]

Disable ally help