There is a struggle for possession of the ball, and as a result Sakuragi falls down. Rukawa is immediately right there on the scene to helpfully prod Sakuragi in the back.

Sakuragi's been under-performing for fear of fouling out, and so Rukawa goes to his rescue with an intentional foul. Take a look at that. An intentional foul. Professional and cool-headed Rukawa does an intentional foul.

And just to make sure his do'aho gets his rhythm back, Rukawa pokes him a bit to get him moving. This conversation was un-provoked, un-necessary and un-Rukawa.

After Sakuragi's dunk and fouling out, Rukawa... well... tries to console/congratulate him in his own way? Another totally un-provoked and un-necessary conversation. I mean, honestly, if I weren't a RuHanaRu shipper I'd be going, "What the hell was that all about? What's up with Rukawa?!"

Sakuragi's being bugged by Kiyota, so Rukawa happily comes to his rescue (again).