[Dazai nods softly. He has to glance away here, if only because even looking at Oda is too difficult right now.]

Because of your abilities, the only way to kill that man was to leave yourself open to getting fatally wounded.

...Himself. The only way he could do it was to leave himself open.

[The way he has to correct himself there is probably pretty telling. He knows that this Oda is a different Oda, it's not his Odasaku, but it's still hard to remember sometimes.]