Skeleton Priest Heals

Can anyone explain to me exactly how this works i kno it gives a dmg buff and heal but how exactly does the heal work is it after 8 seconds or before asoon as u press the button and about the passive heal in the skill tree is that instant too ?

it used to (season 2) be a heal over time with a big heal at the end. at least the big heal was at the end.

This season, I have not been paying attention to it as my skeletons have mostly not been dying, will only really know once I am not as focused on leveling etc when im playing.

yea i still cant figure this out lmao we need help haha

From what I can tell, they only heal once, per 8 seconds. But, you get the damage buff every time you cast it.