Help (With kat)

The best combo you can do with kat is hover her in champ select, then ban her because shes toxic as hell and no1 should have to fight cancer in a video game :)

Just go into pratice tool yourself and try it...?

Yes, ignore the salty people who can't fight Kat in the comments or just say "yes" when ulting as Kat, any daggers that are close enough to be picked up while ulting will be picked up (the damage will apply) and not cancel the ult.

Ignore the bads who dont know how to play.

Yes if you are spinning with your R other falling daggers will also apply damage and will not cancel your ult.

The more reliable combo is to e onto an enemy, press w, then ult. When the w dagger falls you will pick up for instant damage.

Picking up daggers does not cancel ult. Moving might though.

Here's a video explaining a bunch of tricks for using katarina effectively:

https://www.youtube.com/watch?v=G7khsqVUd0Q