[23:55] Jin exclaims, "Geno!"
[23:55] Geno says, "Master"
[23:55] Jin says, "Ugh..."
[23:59] "He's using the technique I 've been trying to master..."

If you hadn't noticed, the skills that Jin used had to do with Fire and wind. This would be the combination of Ifrit claw. The very same magic that Jin had been trying to learn.

Noticeably bummed as he forced that smile over his face. "Ugh..."