Mordekaiser E pulls the soul out of large monster (also passive active when hitting dragon or baron)

when you press E against Gromp; Red Buff; Blue Buff; Dragon; Baron you can see their soul getting pulled out for a split second. I got to say it's fun cus i miss old mord ult. also in the passive description it says it's only active when attacking champions yet it was active when i hit the dragon and baron. my question is, can this be implemented to the red buff and blue buff as well ? if so Mordekaiser can be a very good jungler as well.
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