/stopcasting

[Arnulf]

How exactly does one use a /stopcasting macro? Do you use an add-on to see when your spell completes?

Another idea I had about /stopcasting

Consider the macro

/stopcasting
/cast Counterspell

I would use it like this; I had just started casting frost bolt or fire bolt (any channeling spell) when I notice that my target starts to cast a channeled spell also. Instead of hitting ESC I would press this macro button which would first stop my current channeling spell, thus cancelling it, and immediately do the interruption on my target's channeled spell.

Other classes or races could use Earth Shock, Hammer of Justice, Arcane Torrent, etc. instead of Counterspell.

I haven't tested it though.