Frontliners Tip
Use your "CC reduction" card + "Resilience" to deny point pressure from "Grumpy Bomb".
BK feels relatively safe you while stunned. "Jumping out" of stun earlier, works like surprise effect & confuses him.
Pay attention for his "Poppy Bomb" usage. If you see BK landing with low or even half HP - try to pressure him. BK can't use his escape for next 6-8 second, that would be enough time to kill him.