User blog comment:SpotRudloff/New ARAM anti poke item/@comment-5761259-20130605013856/@comment-5761259-20130605045855

That seems like a good idea.

I would have to say the 300, because otherwise the passive would be worth it late game. If you have a Mundo with 5000 health 15% of that is 750 health shield. I'll take that any day. That's obviously an extreme example but still.

The thing is, a shield really wouldn't mitigate that much poke. Would you be a meat shield while it's up, then hide again when it's on cooldown? That really seems to be the only use for it. Perhaps it blocks the next incoming damage over 120+(30 X level). Or something of that ilk. It would be kind of like a Poppy passive I guess.