HELLO AGAIN!! I decided to double test fire rain with KingSick (aka @Sick) because I knew something was wrong, so skill works with single shot in a very very low rate (It used to work fine in the past so maybe and update fucked it up), so I recorded 2 videos:
Windforce Undefeatable (1%) skill worked in 35 secs on single shot
KingSick (Garges Mace 5%) vs IPheonSlyI (Fire Rain WF 5% with single shots) - Fire rain never worked and garges skill worked 10 times in 3 minutes
PS: I already know skill works with single shot but it needs to be check, I'm sure its pointless to have 5% skill chance and bugged. Thank you in advance.