About fire angel system... Options

[A34Comet]

In Ench there are fire angel system, allowing artillery unit use different fire pitch for different weapon(a precise but shorter range and a long range but inaccurate one)

However I don't get its code's logic
First for different fire pitch there should be two turret, but.....
Turret = TURRET
TurretPitch = TURRETEL
AltTurret = TURRET
AltTurretPitch = TURRETEL

（shocking...）

Well I see if I just copy that there will be a problem, when the unit using its primary weapon. The turret will instantly recover to default state after fire,and will pitch from default if weapon change frome secondary to primary. And the author also said there is some code fixing it:

TransitionState = TRANS_UsingA TRANS_None
Model = AVM270
Animation = AVM270.AVM270
AnimationMode = ONCE
AnimationSpeedFactorRange = -3.0 -3.0
Turret = TURRET
TurretPitch = TURRETEL
WeaponLaunchBone = PRIMARY WeaponA
End

TransitionState = TRANS_UsingAReallyDamaged TRANS_ReallyDamaged
Model = AVM270_D
Animation = AVM270_D.AVM270_D
AnimationMode = ONCE
AnimationSpeedFactorRange = -3.0 -3.0
Turret = TURRET
TurretPitch = TURRETEL
WeaponLaunchBone = PRIMARY WeaponA
End

Can't figur out what it do and how it fix the problem....