Idea for New Vayne W and Passive to Fit Her Lore

Passive: Vayne ruthlessly hunts evil-doers. She gains 30 Movement Speed when moving toward nearby enemy champions. --> Killing an enemy champion heals Vayne for 50-135 (5 per level) + 10% of her missing health. This effect can only occur once every 60/45/30 seconds.

W: Silver Bolts Every third consecutive attack or ability against an enemy deals an additional 6/7.5/9/10.5/12% of the enemy's maximum Health as true damage. Deals a maximum of 200 damage vs. Monsters and a minimum of 40/60/80/100/120 damage vs. all targets. -->Every third consecutive attack or ability against an enemy deals an additional 3/5/7/9/11% of the enemy's maximum Health as true damage over three seconds. Deals a maximum of 200 damage vs. Monsters and a minimum of 40/60/80/100/120 damage vs. all targets. The target is marked for 5 seconds once they start bleeding, and Vayne gains 10-61 (3 per level) movement speed towards enemy units.

Why these changes?: Vayne's lore shows her as a sadistic monster hunter who lives to kill. The passive changes give an idea of Vayne relishing in the act of murder, with her heal. The W changes are a nerf to fit her more into DPS and give her less crazy burst, but now the extra movement speed she got on her old passive is buffed and put onto her W so she can still chase down targets with ease.