Since Derek was unaware of Stiles not being able to function properly, Derek simply walked over to the boy and looked down at him. "So, are you going to mop around another week or are you going to finally do something." He had asked as he kept his arms crossed over his chest for the moment. Derek wasn't gentle. And the reason he was helping was because in some odd way, they were friends.
That and Malia had asked Derek to check in on Stiles. A mixture of that and Malia crying was enough for Derek to try and fix the stupidity that ran within this group. He leaves for a day (at least it felt like a day to him) and all hell breaks loose in this pack. Still he rubbed his eyes with annoyance at this band of misfits.