Seifer stumbled back as a fairly young man pretty much walked into him. Usually he'd have just stood his ground and let whoever it was bounce off of him, but with his current physical weakness, that was pretty much impossible. That wasn't a good sign, although Seifer refused to admit that to himself. Even feeling as crappy as he was, his mind was sharp. While he was stumbling back, he was sizing up the guy that walked into him. It only took him a few seconds to size the guy up, a skill that any soldier would tell you was essential for not just the job, but survival.
Seifer didn't flinch away from the man's hand. He wasn't behaving hostilely. Normally that wouldn't be a concern, as Seifer felt fairly sure that he could take the older man if he were in a better physical condition, but his cockiness about his own abilities kept him from considering the older man as a threat even now. It took him a second longer to recognize a few familiar behaviors. Balamb Garden had an infirmary, and a wild child like Seifer ended up there more often than most. Seifer's more than passing familiarity with the brusque doctor there, Dr. Kadowaki, allowed him to connect a few dots quicker than most would have.
It also helped that the guy was walking into an infirmary while reading a file.
The similarities only grew as the guy talked. It was pretty clear as the doctor turned that he expected Seifer to be a good little patient and get back down on the bed. Unluckily for the doctor, Seifer was probably the furthest from a good little patient anyone could get. Instead of going dutifully prone on the bed, Seifer pushed himself off again and began half-stumbling, half-walking toward the exit again, snagging his gunblade from where someone must have left it near his bed. He glanced at the doctor when he heard the man's question and gave him a weak shrug. "That's the first time. Summoning doesn't do that," he waved carelessly toward the bed with his free hand and nearly lost his balance, but caught himself at the last second, "that, to you. It's not supposed to, and it never did back home. I wasn't expecting it." He added a weak smile and a quick, "But I'm fine now!"