What should I expect from my co-healer? (And vice versa)

[Rein_eon_Osborne]

[...]However, earlier today I was going for a M8S Phase 1 kill and we died to... the first multi hit stack, and I was doing the same I've been doing the past weekend. The other healer said the same. Welp, we go again and I adjust Seraphism (is the one I use there, along with sacred soil and Fey Illumination so it mitigates the full stack. Move forward in time and then we die to the big aoe that comes after adds.

So that made me think maybe my "plan" was not the best, even if I was doing the same as the previous pulls where I had no problems. However, the damage was done and the mood in the party was already a bit meh from dying to damage (understandable)[...]

I personally haven't done any savages this expac, but this case over here is an example of lack of communication. Don't get me wrong though; having a plan is always a good start. Willing to adjust is another good quality to develop. But at some point, you (and the rest of the party) need to acknowledge that the other 7 players aren't trust NPCs. Share them the crucial parts of your plans i.e. "I'm going to mit X with Y, but that means I will have nothing for mech Z etc." Those crucial parts usually being (not an exhaustive list):

• WHM: knows where they put down their Lilybell, Temperance, and Divine Grace.
• AST: knows where they uses Macrocosmos, Neutral Sect, Sun Sign, and Collective.
• SCH: knows where they deploy Spreadlo, Soil, Seraph, Expedient, and Seraphism.
• SGE: knows where they blast their Pneuma, Panhaima, Holos, & Philosophia.

By knowing those abilities, it should give you a general idea of what your cohealer have and don't have at the time of XYZ mechanic happening. Don't shy away from necessary basic GCD heals to patch up some unexpected turn of events, too (i.e. you notice some mits missing from XYZ mech? No AF because of your plan? Use that Concitation if opportunity allows). People nowadays deconditioned to develop bad habit of avoiding GCD heals entirely when it could've easily save some pulls.

Oh yeah, hopefully your dps and tanks aren't sitting on their Feint/Addle/Reprisals too lol. But otherwise, I think you have a solid foundation to work around with.