Beating cleric in arena, but they receive 0 damage

[shutterbug]

Hello,

PST: 1820.
I'm currently in the arena battle, am a rogue and have hit an inactive cleric. I won, but it says: You are victorious in battle, taking 38 damage and dealing 0 damage to your enemy.

I took screenshots, but don't want to paste them publicly, to keep the privacy of the person. I was in a battle yesterday where said person was on my side, inactive, and an opposition mentioned the same glitch.

I want to make clear that I'm not accusing the person of cheating, but that there may be a glitch.

Please let me know where I can send the pictures. Thank you