How not to be a mentor

[Raraka]

Need more context and both sides of the story because sounds a bit sus for an expert dungeon. Just don't be a healing bot, the faster mobs die, the less you have to heal.

My guess would be one of those:

Ast: Suggestion among the lines of using Synastry first would allow them to reduce healing gcds, and keep up dps
Whm: They were using cure 2/medica 2 over lily spells, could be building for the blood lily
Sch: They were Adlo spamming instead of using the fairy tentacle plus soil, and, well any oGCD to keep using art of war
Sage: They were spamming eukrasian diagnosis instead of using haima and taurochole/kerachole

Any of those should be enough to keep up a tank alive trough a big pull if the tank is half decently rotating their mitigation

Otherwise they could have just waved it off saying "Im a bit undergeared, I understand too". But yeah without the specifics of what the other person was saying, and the gear the tank was wearing, its hard to tell if OP is at fault here or not