That's ikon's Yunhyeong. I'm 100%sure because at that time Jinhwan hair color is brown and Yunhyeong's hair color is white. You can clearly see BI and ju-ne
ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-bO62pVLsCLU.html As far as I've searched, there is no video that captures bambam's reaction to lisa's FULL rap but here is a video that shows bambam's reaction to the part of the rap that they are on the second platform of the stage.
This video isn't the clearest but you can see Got7 on the bottom right. It includes Lisa's rap. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xo0JkS_HsOk.html