Because no one gives anything for free.

And you have every right to hold a grudge.

Still...Yuugi's answer seems to bring Kaiba around enough to stop looking so manic, even if it's just a little. Maybe not completely, but...enough that he knows this man as the one who he still sought a victory against. It's still Yuugi. But the question is, if Seto is still himself?

The more time passes, the more he wonders.

Even if the Enforcers knew...it wouldn't stop them anyway.