That's mean.

Seymour had some amazingly-delivered lines.

Like when you finally confront him in Macalania:
Final Fantasy X Walkthrough Part 58 Macarena Temple - YouTube

I love that "if you're offering your lives" line. It's so smug and matter-of-fact. Reminds me later when Kimahri spears him right through the frickin' heart and all he does is say "Unpleasant."