Armpit was a weasel guard who stood watch over Captain Rubén's tent while the crew lay encamped along the coast.
When Rubén realized that the coast he had brought his crew to had no prospective victims to kill or rob, he sought to blame somebeast. Unfortunately for Armpit, he called the weasel in and decided to question him, asking whether the weasel had heard Foxclaw or Gringer suggest the Coast. In an addlebrained attempt to prove his intelligence to the Captain, and not recognizing the Searat Captain's sarcasm when he called the Coast ¨wonderful¨, he told his captain that he had suggested it.
In response, his captain strangled him to death, leaving the weasel's corpse to rot in his tent.