exodus: It goes like this:

You lost the battle
Round 1
Cupcake use spell Murder: 60 spell damage. (Oreo health left: 384)
Cupcake hits oreo: 107 hit damage
(Oreo health left: 277)

Oreo use spell Flying cookie: 59 spell damage. (cupcake health left: 756)
Oreo hits Cupcake: 123 hit damage (cupcake health left: 633)

Round 2
Cupcake use spell Murder: 53 damage. (Oreo health left: 224)
Cupcake hits oreo: 78 damage
Oreo health left: 149)

Oreo use spell Flying cookie: 65 spell damage. (cupcake health left: 56
Oreo hits Cupcake: 234 hit damage (cupcake health left: 334)

Round 3
Cupcake use spell Murder: 61 damage. (Oreo health left: 85)
Cupcake hits oreo: 110 damage
Oreo (died)

Cupcake total hit damage: 469
Oreo total hit damage: 481.

When you click on the map again.

(MAP screen)

Would you like to attack:
Oreo.

Oreo
Level: 269
Health: -25/14344

That will appears.
It would be just like an advance damage to the next monster. But still you lost the last battle. I hope this make things now clear.

sjustins: its happend to me multiple times on my server 2 chr. i killed one arctic sharpshooter 3 times and everytime it gets all its life back instead of dieing. it happend on a few quest monsters and just now with a giant

ueki09: But alway said died and died even it did not hit me?

deathnote13: also life leech

ueki09: Im not healing or using mana shield

idiot_terror: It happens if you're using mana shield or heal in your spell set. You recieved more damage than your health.
For example you have 100hp and you recieved a total of 101 damage from enemy, probably you are dead already but if u use mana shield, some of damages were absorbed (same thing happen with heal).