After a crew attack: total up how frightening the resistance is, then roll a script nibble — if the nibble is below the total (and is not 15), the alien flees to a random adjacent room and every fighter present gains courage and morale (+1 each, courage capped at 8). The total counts, for each of up to three crew in the room (the attacker + room-mates from 37876): +1 if a fit (strength 3+), in-combat (state 4) fighter is Confident (morale 4+); plus the alien's wounds / 4 — a hurt alien is easier to drive off.

The INC (HL) at the end of the 38050 weapon check is unreachable: the two comparisons before it demand A = 6 AND A = 7 at once (JR NZ where the intent was presumably a 6-12 weapon range check), so the intended "armed with something serious" bonus never applies — an original-game bug, preserved as-is.