I understand, but you won that matchup fair and square; there's no reason for you to just back away now even if there are other commitments involved.
And even if you do give Amphibious a free pass, what happens then? If he becomes the champion again, then because of you bowing out that'll rob a fair contest win out of Wildfire or whoever's left in the Robotnik Bracket. No disrespect to Jordan here, but I'm pretty sure I'm not going to be the only person that'll be disappointed if that happens, regardless of the outcome for this particular match.
[EDIT: ...well. Damnit. Commented way too late.]