(Spell 748) Chaos Surge

[Ian]

Obviously a stupid waste of op powers, but here it is anyway.  I learnt the 0-mana spell of Chaos Surge [chsu] (#748).  Being a witchunter (and obviously having 0 mana) makes this interesting:

[HP=3534]:stat
Name: Ian ChangeMe                     Lives/CP:  9/22065
Race: Half-Ogre   Exp: 107878560484681 Perception:    330
Class: Witchunter Level: 289           Stealth:         0
Hits:  3534/3534  Armour Class: 0/0    Thievery:        0
                                       Traps:           0
                                       Picklocks:       0
Strength:  150    Agility: 60          Tracking:        0
Intellect: 60     Health:  150         Martial Arts:  319
Willpower: 70     Charm:   60          MagicRes:      175
[HP=3534]:chsu
You attempt to cast chaos surge, but fail.
[HP=3534]:chsu
You do not have enough mana to cast that spell.
[HP=3534]:chsu
You do not have enough mana to cast that spell.
[HP=3534]:sys heal
Player healed
[HP=3534]:chsu
You attempt to cast chaos surge, but fail.
[HP=3534]:chsu
You do not have enough mana to cast that spell.

I seem to have to wait for a regen tick (or sys heal myself) to get enough mana (;)) to cast this spell again.

[Ian]

[HP=3534]:fire tyr
*Combat Engaged*
You cast Dancing fire on Tyrannosaur for 343 damage!
You cast Dancing fire on Tyrannosaur for 280 damage!
You cast Dancing fire on Tyrannosaur for 243 damage!
You cast Dancing fire on Tyrannosaur for 389 damage!
You cast Dancing fire on Tyrannosaur for 152 damage!
You cast Dancing fire on Tyrannosaur for 182 damage!
You cast Dancing fire on Tyrannosaur for 205 damage!
You cast Dancing fire on Tyrannosaur for 199 damage!
You cast Dancing fire on Tyrannosaur for 325 damage!
You cast Dancing fire on Tyrannosaur for 156 damage!
You cast Dancing fire on Tyrannosaur for 258 damage!
You cast Dancing fire on Tyrannosaur for 313 damage!
You cast Dancing fire on Tyrannosaur for 347 damage!
You cast Dancing fire on Tyrannosaur for 254 damage!
You cast Dancing fire on Tyrannosaur for 214 damage!
You cast Dancing fire on Tyrannosaur for 269 damage!
The lizard stumbles to the ground with a loud crash!
You gain 324967500 experience.
*Combat Off*
[HP=3534]:sys summon 514
Tyrannosaur walks into the room from nowhere.
The Tyrannosaur savagely bites Valentine for 49 damage!
[HP=3534]:chsu
Valentine moves to attack Tyrannosaur.
Valentine says "I'm scared"
You attempt to cast chaos surge, but fail.
[HP=3534]:fire tyr
*Combat Engaged*
[HP=3534]:
Stone Tunnel, Dead End
Also here: Valentine, Tyrannosaur.
Obvious exits: north
Valentine critically slices and dices Tyrannosaur for 170 damage!
Valentine slices and dices Tyrannosaur for 34 damage!
Valentine slices and dices Tyrannosaur for 16 damage!
Valentine critically slices and dices Tyrannosaur for 269 damage!
Valentine slices and dices Tyrannosaur for 22 damage!
The Tyrannosaur savagely bites Valentine for 171 damage!
Valentine casts major healing on Valentine!
Valentine moves to attack Tyrannosaur.
[HP=3534]:fire tyr
*Combat Off*
[HP=3534]:*Combat Engaged*
Valentine slices and dices Tyrannosaur for 25 damage!
Valentine slices and dices Tyrannosaur for 34 damage!
Valentine slices and dices Tyrannosaur for 26 damage!
Valentine slices and dices Tyrannosaur for 29 damage!
Valentine slices and dices Tyrannosaur for 57 damage!
The Tyrannosaur savagely bites Valentine for 264 damage!
Valentine casts major healing on Valentine!
Valentine moves to attack Tyrannosaur.
[HP=3534]:sys heal
Player healed
Valentine casts major healing on Valentine!
Valentine moves to attack Tyrannosaur.
You cast Dancing fire on Tyrannosaur for 216 damage!
You cast Dancing fire on Tyrannosaur for 212 damage!
You cast Dancing fire on Tyrannosaur for 244 damage!
You cast Dancing fire on Tyrannosaur for 392 damage!
You cast Dancing fire on Tyrannosaur for 292 damage!
You cast Dancing fire on Tyrannosaur for 186 damage!
You cast Dancing fire on Tyrannosaur for 198 damage!
You cast Dancing fire on Tyrannosaur for 330 damage!
You cast Dancing fire on Tyrannosaur for 223 damage!
You cast Dancing fire on Tyrannosaur for 233 damage!
You cast Dancing fire on Tyrannosaur for 209 damage!
You cast Dancing fire on Tyrannosaur for 257 damage!
You cast Dancing fire on Tyrannosaur for 234 damage!
You cast Dancing fire on Tyrannosaur for 203 damage!
You cast Dancing fire on Tyrannosaur for 160 damage!
You cast Dancing fire on Tyrannosaur for 362 damage!
You cast Dancing fire on Tyrannosaur for 254 damage!
The lizard stumbles to the ground with a loud crash!
You gain 324967500 experience.
*Combat Off*

This "lack of mana" or "between-rounds" spell seems to stop me from attacking.? With a 0-energy spell.? I don't know enough about the backend of mmud, let along gmud, to theorise what is going on here.