Garen wins all day long. There is no denying that. Also can't Garen's Q stop Kat's ult?
Anything that moves Kat stops her ult, Silences stop her ult, Knock ups stop her ult, Stuns stop her ult, walking away stops her ult though you better be quick if you want to use this method. It's very easy to stop, if you catch it early.
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