I was bored so I made a Warwick Rework, Thoughts?

Please note I have no idea how to number balance, so feel free to use your own numbers.

Passive: Predator or Prey

If Warwick damages an enemy Champion or large monster 3 times in quick succession, they become marked. Marked targets become Prey, when they are below 40% Health. Warwick gains 50% Attack Speed against Prey and every 3rd damage dealt steals 6/7/8% mIssing Health (at levels 7/13)

Q: Hungering Strike 70 Mana 14/13/12/11/10 Second Cooldown

Warwick lunges in target direction, and deals 80/100/120/140/160 (+60% AP) (+4/5/6/7/8% Current HP) to the first enemy Champion or large monster hit. If Warwick hits a target, he heals for 70% of the damage dealt or 75/95/115/135/155 (+2.5% Max HP), whichever is higher. Cooldown is reduced by 40% if Warwick hits a target.

W: Wolf's Rage 40/45/50/55/60 Mana 6 Sec CD

Warwick lashes out in a circle around him, dealing 50/80/110/140/170 (+40% AD) physical damage to all targets around him (bonus 50% damage to monsters), slowing all targets for 60% decaying over 1 second. Warwick gains 4/5/6/7/8% Movement Speed for 1.5 seconds per target struck.

E: Feral Instincts

Passive - Blood Scent: Warwick reveals targets below 40% Health within 3000/4000/5000/6000/7000 units. Warwick gains 20% Movement Speed towards revealed Champions.

Active - Night Howl: Warwick deals 80/100/120/140/160 (+50% AP) magic damage to nearby enemies, fearing them for 0.6/0.7/0.8/0.9/1 second. Range and fear duration is doubled against Prey

R: Infinite Duress 100 Mana 120/100/80 Second Cooldown

Warwick blinks to target enemy Champion, suppressing them for 1.5 seconds and applying on-hit effects 4/5/6 times over the duration.

Kills or assists on Prey Champion heal Warwick for 8/10/12% of his missing Health.