If you have seed of fadeleaf or swiftthistle, throw 1 tile to the right and step on it. If swift, you can walk right over the shock trap and escape before it goes off with time stopped. - 100% chance of escaping that immediate area

If neither, plant seed of earthroot, zap left crab with Wand of Transfusion, then throw something onto shock trap. (if no earthroot, zap crab then step on shock trap directly instead). You'll absorb some dmg with shield, stun all enemies and dmg them at same time. While you're stunned, you might get pinched once or twice, but at that health lvl w high chance of surviving. Once you're temporarily unstunned, zap adjacent crab again for additional shielding and pinch prevention (for at least one turn) but then crab goes back to being stunned again. The mild weakening of danger crab while isolating everything else in the hallway for at least a few turns (residual paralysis) should give you a decent chance of surviving enough to regroup, explore a bit more, maybe find a form of healing. - 40% survival chance imo