How does Illaoi E work exactly

so yeah ive been playing a game yesterday where an illaoi just got out of control dealing 79% of my hp with her E. sadly for some reason the game doesnt show up on but i do have a screenshot.(its still in my match history too 16/9/4 {{champion:122}} ) the way i thought it works is 45% of the damage on the spirit jumps over to me +8% per 100 AD but to deal that kind of damage she must have had 600AD am i getting this skill wrong or what i really think we lost the game cause of that damage {{champion:420}}
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