User blog comment:IonicZach/Ship Wrecked: A Thunderbird WDYD? Response/@comment-26380985-20160215162643/@comment-27049723-20160215163839

Well in the story you said the harpoon was already half way through and most harpoons have hooks near the tip to keep it lodged in, so the only way to remove it without causing more damage was to just pull it all the way through.

Also, she's a monster and monsters are pretty tough and as long as they get enough spirit energy can heal almost any wound.