It had not exactly occurred to Kaito that all damages and et cetera would be coming out from his own pocket. So what if he was getting sticky and dirty and wet? He could always take a shower later. What was most important was- revenge had to be taken and in some strange way, he was very much enjoying himself.
Scooping a generous amount of the stickily sweet syrup, he splashed it onto Akira (who was just a convenient target, really) before rushing forward to empty the entire vessel of it on top of Sano's head.