Livre de règle page 86 a écrit
If the armour of the player hit is broken, they become Prone and an Injury roll is made against them.
Livre de règle page 23 a écritA Turnover is caused:
• If a player on the active team Falls Over during their
own activation.
• If a player on the active team is Knocked Down during
their team turn.
• If a player on the active team that is in possession of the
ball is Placed Prone during their team turn.
[...]
Donc, comme tu l'as bien présumé, il n'y a pas de turnover, à moins que ton Troll ne porte la balle à ce moment là.