"You can't run from your shadow"

When he kills someone with his ult? They could have this voice line in the game already and it will still never get heard

Well they can't add that as it would be a blatant lie, assassin kayn has such an abysmal winrate that people must be able to run from shadows as they are winning more often then not.

Rhaast form is barely acceptable, kayn is just crap, vs'd a shadow kayn recently that only had a few hp left but no dots or anything on him and ulted our low hp carry, our thresh flayed at the adc's feet and killed kayn before his ult went off.

also interesting fact all aoe spells in the game can hit both kayn and Rhaast when ulted which means if either enter a friendly adc at low hp just cast your aoe on the adc and kill them and watch the ult fizzle.