Soraka's Astral Infusion paradox in text

Soraka | League of Legends
A healer gifted with the magic of the stars, Soraka holds all living creatures close to her heart. She was once a celestial being, but she sacrificed her immortality and entered the world of mortals. So long as evil threatens life in Valoran, Soraka will not allow herself peace.
If you read closely the text in Soraka's W - Astral Infusion, it doesn't make sense at all. It costs **10% of MAX HEALTH** (+some mana) and at the end of that text is written, that she cannot play it when she is under **5% of MAX HEALTH** She should die when she play it at 7% of health but she never dies by healing. I guess that it's supposed to be "under 10%" instead of ~~"under 5%"~~, because Soraka cannot play it when she doesn't have enough health for that. It's just minor bug in text, but it can be missleading.
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