In case anyone is wondering, Witchbolt had a much better chance of working. Crown of madness is a saving throw for the target and I was worried it might be too easy. Crown of madness only lets me control their attacks, not their other actions. They could simply run or try some other way around it. I was also worried that the cultist would not be doing much damage, or would quickly be cut down by his allies in the process. Also dragonclaw dude seems as though he could easily beat the DC (13) to beat the crown of madness as well.