First of, if this is a repost, I apologize, couldn't find anything with the search function.
Second, this might be common sence, but it's in the air that someone in ehre doesn't know it!
The trick.
Get yourself 2 (Two) off hand weapons. i.e. use your old Gladiator's Shiv.
When you join the arena you apply Wound to your main hand and crippling to your off hand as you always do. Then, you also apply Wound onto your 2nd off hand (Gladiator's Shiv!). When the fight begins, you have the 1st OH equiped, get your crippling up, change to the 2nd OH and Shiv up your wounds. When your target reached 5 fast wounds, put on your 1st OH again.
Some might aswell think this is useless, but hey, I don't think so!
Best Regards,
Neax.
Edit: This works as good with putting on a mind numbing every now and then. Thanks girm412!