[@KoL]
I didn't know at the time of that post that we wouldn't be fighting eachother as the objective. I get the basic layout of Fate Grand Order now, but I have to ask how common is infighting and backstabbing in these scenarios? 

I don't think it would be very likely that Heroic Spirits would activate Noble Phantasms, especially ones that make them lose self control during a friendly sparring match.