Deneb: Mordecai...I'm sorry...I'm so s-sorry... I-I should have knew about Zeuka and stopped him before he...I...I'm really sorry! *cries*
Mordecai: Ssh, ssh,ssh... is okay Deneb, is okay.
None of us really knew that coming, besides Rigby and I along with everyone else at the park had already dealt with this sort of stuff like that before, so come on, don't hit it on yourself so hard.
What really matters the most is that everyone's safe for now.
And you at least have your other pals to help you...especially Kaoru and Tavi...And you have to be strong for them, just like they been strong for you.
Mordecai gives Deneb some confort
Probably after everyone went through a dangerous encounter with Zeuka nearly killing someone or something like that.
Weather's you see this as romantic or like a older brother comforting his younger sister, depends how you like to see it.