I had First Aid and Moused over Shiron and saw they had 43/50 hp. I used a first aid kit on them (again, the drop down said Shiron 43/50) and got the message:
- You heal Shiron for 10 points of damage. You gain 10 experience points. They are now fully healed. (2021-12-04 05:54:01).
This happened just after I had healed another character with 2 FAK's for 20 hp. Shiron is listed hostile by my faction.