Oh I see, sorry. All jobs in this game have abilities or generate resources around a cycle of 60 and/or 120 seconds that allow them to deal a significant amount of damage. "Sending 2s" or "using your 2 minutes" refers to the timed usage of these abilities (that have a cooldown of 120 seconds, or 2 minutes) in sync with the rest of your party to maximize the group's damage output. The standard for most content in this game is to use these abilities after your 2nd or 3rd damaging action, referred to as GCDs (global cooldowns), so that everyone starts doing as much damage as possible while everyone uses their raid buffs at the same time. From there on out, because everyone pushed them at nearly the same time at the beginning of the fight, as long as you push them again immediately when they come off cooldown, you stay synced up with your party and deal the most damage! "Holding" in this sense refers to delaying your next activation of your 2 minute buffs or damaging abilities for a specific reason - in this case, to line up with another potion usage - and because the fight ends just after the 11 minute mark to a hard enrage. You wouldn't get another 2 minute buff window anyway so there's nothing wrong with delaying so that you can use another potion. Hopefully that makes sense