Room spell + Single target combat bug

[Greater]

[HP=645/MA=293]:e
A hill giant shaman stomps into the room!
A hill giant stomps into the room!
A giant war dog enters the room from east.
Giant Fortress, Massive Gate
You notice 1 gold crown, 4141 silver nobles, 2 giantwood clubs, fur-lined pouch
here.
Also here: small hill giant shaman, thin hill giant, giant war dog.
Obvious exits: east, open gate west, northeast, southeast
Leper walks into the room from the west.
Leper moves to attack small hill giant shaman.
Leper moves to attack small hill giant shaman.
[HP=645/MA=293]:quak
*Combat Engaged*
The small hill giant shaman smashes you for 2 damage!
The small hill giant shaman smashes you for 18 damage!
The thin hill giant smashes you for 19 damage!
The thin hill giant smashes you for 14 damage!
The thin hill giant smashes you for 14 damage!
The giant war dog hits you, but the swing glances off!
The giant war dog hits you, but the swing glances off!
The giant war dog snaps at you with its teeth!
You make a sharp gesture!
An earthquake rocks the room for 292 damage!
Leper hurls a throwing hammer and strikes small hill giant shaman for 36 damage!

Leper hurls a throwing hammer and strikes small hill giant shaman for 61 damage!

Leper hurls a throwing hammer and strikes small hill giant shaman for 40 damage!

Leper hurls a throwing hammer and strikes small hill giant shaman for 62 damage!

The hill giant shaman lets out a yell and falls lifeless.
Leper moves to attack thin hill giant.
The thin hill giant swipes at Leper with their giantwood club!
The thin hill giant swipes at Leper with their giantwood club!
The thin hill giant swipes at Leper with their giantwood club!
The giant war dog hits you, but the swing glances off!
The giant war dog hits you, but the swing glances off!
The giant war dog snaps at you with its teeth!
You make a sharp gesture!
An earthquake rocks the room for 333 damage!
The hill giant falls to the ground with a crash and dies!
You gain 3000 experience.
You make a sharp gesture!
An earthquake rocks the room for 333 damage!
The giant war dog lets out a yelp and dies!
You gain 1800 experience.

In this example, the person rooming didn't get experience from the first kill despite being engaged with a room spell. The engine seems to not give credit for being in combat with the monster while casting a room spell unless the room spell does fatal damage.