Is this typical tank behavior in DF dungeons?

[Edax]

If they were moving slow and they dsiconnected it sounds to me like they had connection issues or lag.
Also plenty of level 70 players are new.The way leveling is now your character level doesnt define how new you are anymore.Also i never said specifically the tank could be new.

Usually it's the polite thing to do to tell the team your lagging or having connection issues, instead of just instantly quitting because the team asked you to move faster. And no, she did not disconnect, you can tell when a player has quit a duty cause their portrait disappears.