exactly how does pink bean work?

2) Going by the timer is literally the worst way to go about it. If you get distracted for one second you will die. Follow his attacks, react accordingly. That's all there is to it.

Timer is much much better. When DR is on cooldown and it's safe to attack him, I just attack. When it gets to the point where DR is off cooldown, I only attack when he does animations. By only attacking him during animations you waste a lot of time.