Unexplained hit point loss

[Tigris]

Can anyone explain to me where or why i lose the 17 hps at the end of this script. Maybe its obvious but I seem to be missing it and this isn't the first time I've noticed it.

<835hp 215ma 125mv |+23|+15|+9>
A lung patient hates your guts!
You feel a sudden rush of excitement!
A lung patient makes a strange sound, as you place a thunderbolt in his back.
The wound turns black from the poison on your blade.
A lung patient makes a strange sound, as you place a thunderbolt in his back.
The wound turns black from the poison on your blade.
You report 855/937 hp. Change: +20. Need: 82. Spells: greater fluidity, aegis.

<855hp 215ma 125mv |+23|+15|+9>
Surfnazi utters the words, 'yfaghbarh'
A lung patient screams in pain as Surfnazi's frostbolt freezes him.

<857hp 216ma 126mv |+23|+15|+9>
cl
You bury your weapon to the hilt!
A lung patient suddenly stiffens, as you place a thunderbolt deep into his side!
A lung patient is dead! R.I.P.
You receive 516335 experience points as your share.
Surfnazi receives 609615 experience points.
Total exp for kill is 1125950.

Your blood freezes as you hear a lung patient's death cry.
You get gold coins from the corpse of a lung patient that's on the ground.
There were 2791 coins.
You split 2791 coins. You keep 1396 coins.
You report 838/937 hp. Change: -17. Need: 99. Spells: aegis, greater fluidity.

[Atwell]

That's the removal of the 20hp you gained from warcry.

[Tigris]

Thanks!
That makes sense. I forgot Surfnazi just got that skill.