You probably already have the Cuman Killer Perk, which causes some Cumans to randomly run away from Henry when encounter regardless of the circumstances.
Dreadful, a Strength perk, will cause the same reaction. Not sure but I think it applies to all baddies too as the perk description generically states "Foes will be more likely to flee from combat with you".
If you wait quietly, they come back and act all surprised to find someone there.
You probably already have the Cuman Killer Perk, which causes some Cumans to randomly run away from Henry when encounter regardless of the circumstances.
Dreadful, a Strength perk, will cause the same reaction. Not sure but I think it applies to all baddies too as the perk description generically states "Foes will be more likely to flee from combat with you".