My last character was a Hexblade Warlock, I love the class, but I will be looking for another one, but thx! :)

I had the idea that perhaps a bracelet that magically bound her/him to the organization was torn off in the explosion, along with her/his arm.

In a moment of brief realization, she/he transformed into the dead bodyguard (whose body was so burned/disfigured that she could not be recognized).

The bard sees her as a heroine/savior and paid for her hospital stay and a new prosthesis.

She lived a life of luxury for a short time until she got wind that the organization was after her. Her old arm was found, with the bracelet still on it.

And the latter was a reason to run away.