Best technique for having an ability block a concurrent ability?

[desertGhost_]

EDIT:

I found that overriding ShouldBlockAbility works great.

        public override bool ShouldBlockAbilityStart(Ability startingAbility)
        {
            return startingAbility is SpeedChange;
        }

Hi, what would be the best way for having an ability disable a concurrent ability (e.g. blocking Speed Change)?

Thanks.