I have encountered also one problem related to this quest. I killed Griff (it was my first fight in Fort Joy) and released Elf before talking to Stingtail. After that, I went to Stingtail and in the dialog, I get options, like eat drudanae or give it back to release Elf, what's kinda stupid since it's already free!
There should be options:
-> if Elf is free: *Slap Stingtail and tell him that you don't like when someone tries to freeze you*
-> if Elf is free and you have Griff's shirt in back: *Offer Stingtail to take Griff's shirt and tell him that you have to talk with Griff, but you will be back soon.*
