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The point of this build is to tank AoE specials from the likes of Ophelia supported by dancer. It can also work on F.Morgan.
QR activates if he has at least 30 HP when combat begins (31? Not sure about the rounding).
Ophelia +atk using L&D has 60atk. The ploy brings her down to 55, so blazing AoEs hit for 11 damage, which means QR still activates. She will hit him twice for 1 damage each time (because blarserpent doesn't help him when the blazing special hits but now it does), and she will lose badly when iceberg activates. If both have no merges, his QR will still be good when the dust settles.

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