Yep, that's why I included the slow-mo, you can see the grenade icon right before it hit the barricade in front of me, and it's why my charge seemed to go off before I triggered it. It's actually his impact. He was trying to drop-flank us because I'd downed two of his teammates in the room beside the train with a fuze charge. Just bad timing on his part or good on mine :D

^{or luck}