Towers are a one shot.
Extreme edge is usually a one shot because timing removing the bleed is really tricky and only a tank has the HP to survive the first tick.
Missing a sand sphere DPS check is a raid wipe.
Going to the wrong place and getting a double stack marker is a one shot at best, if you take that second stack marker away to die alone. At worst you take half a group with you if you try to stack two of them up.
Rock cutter is a one shot if you're not a tank.
Earth hammer is a one shot.
What does he do that isn't a one shot if you mess it up aside from jagged edge?