I love this sequence.  In their tag-team duel with the Light and Dark Mask guys, Kaiba has just sacrificed his Blue Eyes White Dragon so that Yami no Yugi had time to combine his magnet warriors into Magnet Valkerion.  When Yami hesitates instead of attacking the Light and Dark Mask duo, Kaiba immediately jumps to the conclusion that Yami was just using him and that he’s about to be betrayed.  

I love Yami’s response.  He immediately tells Kaiba that if he needs Yami to attack he’ll do it, regardless of consequences.  For possibly the first time since his parents died, someone has not only taken Kaiba’s emotional needs seriously, but has actually put Kaiba’s emotional welfare above their own agenda.  Then Yami does something just as remarkable: after telling Kaiba to calm down, he backs off and gives Kaiba the time he needs to focus, think things through for himself, and to understand what Yami was trying to tell him.  Yami waits until Kaiba gives the word to attack – and I love the smile on Yami’s face when Kaiba comes through.

Earlier in the duel, Yami asks for Kaiba’s trust.  Here he shows why he deserves it.