Unable to attack with spells in PVE in arena

[Abyssyml]

Whilst doing some testing in arena, anytime I tried to attack another player with a direct damage spell it would not allow me.

[HP=238/MA=212]:plas grand
*Combat Engaged*
*Combat Off*
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
Your spell has no effect in this room!
[HP=238/MA=212]:
Crimson Chamber
Also here: Grand.
Obvious exits: south
The room is dimly lit
[HP=238/MA=212]:

I could attack him using room spells however.