bug or intended. warwicks ulti + rapidfire cannon

warwicks ulti 5 mini hits do not charge rapidfire cannon extra fast (thankfully it fires the cannon tho)

ruunans charges rapidfure + shivv extra fast. and ruunans does extra " on hits" and warwicks ulti is 5 "on hits"

so. question. should warwicks 5 mini ulti hits charge rapidfire faster?

also. i guess warwicks ulti doesnt charge fervor fast too (i assume). i think fervor is "on attack" tho