I mean, yeah it's possible— but Eichi's constitution wouldn't make it much of a fair fight even if Jae-ha was drugged.

[ He shouts over his shoulder to wherever Eichi is ]

No offense!

[ anyway ]

Since the leg was ripped off Jae-ha clearly wasn't knocked out cold. Even if Eichi had help it's pretty hard for me to imagine him ripping the guy's leg off like that. That's a tough thing to do even with super powers.