- Mana Barrier's cooldown starts as soon as it activates, not when it ends.
- Any damage that puts Blitzcrank below 20% of his max. health is instead dealt to Mana Barrier.
- If Blitzcrank is killed from anywhere higher than 20% of his max. health (e.g. from massive burst damage), Mana Barrier will not activate and it will not go on cooldown.
- If Blitzcrank is already below 20% of his max. health when Mana Barrier's cooldown ends, it will not activate until he takes damage again.