Is this a glitch?

Kymaera K1ng

A PMCC player
Sometimes when I use Fox's Shine, the opponent can act almost immediately out of it in the air. this doesn't happen in (Project) Melee, and I would like this to be fixed. Once I shined my friend playing roy, who immediately D-Aired and killed me. I can't recreate it, but it happens quite frequently to me.
 
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