unicorn bugged

I've experienced the unicorn dying as creeps pass it, and not as described ( where it happens when creeps survive and cause life loss)

It works like that. They have to exit it's range.

Mine died when a goblin entered its range.( this would really be a big) And the description sounds more like what travel said.

Maybe the description is not good. But the mechanism works like this: As soon as a creep enters unicorns range, it receives 20% of max hp damage. If it lives after this hit there is a 25% chance that it kills the unicorn.