So apparently that's a thing. Like, MF ults > Lulu ults MF during MF ult, auto cancels MF's. I dont remember it doing that before because I've played MF/Lulu lanes before, and I simply don't remember that being an issue. I can see HOW it might cancel her ult but....it just doesn't seem fair that it does.
Is this a bug or just something purposeful? Irritating either way but....
It's a bug.
Lulu's ult does not interrupt ally channels, and never should.
Agreed, MF ult shouldn't get interrupted by an allied Lulu ult. Thankfully, from what I can see it doesn't. Do you have a video of this occurring, or is it possible something else happened at the same time that actually interrupted the ult channel?
It would make sense for an enemy MF but I'm shocked it still functions like that for allies as well.
If you ever want to piss off an allied MF 
Try to get a video of this and post it in the Bugs section.
it should
mf shouldn't get a gamebreaking ult and tank stats at the same time, it's just disgusting
I'll just add this here.
I tried doing the same thing in a custom game, MF was still ulting. Did you remember what else was happening that caused MF to stop ulting? Or did MF cancelled it on her own and didn't realize?
