Ren further explained his strategy in defeating Vulcan. The only method that was effective at their current ATP. It was tested and proven, and as long as the girls followed his instructions, everything would go according to plan.
"If you look at Vulcan's spell again, you'll notice that two of its active skill required him to move, [Blink] and [Vulcan Charge]. However, if you analyze its passive skill [Fire Rain], it will remain on its spot as long as its minions are alive. And so it couldn't do [Blink] and [Vulcan Charge]. And if it couldn't move and blink to a certain area, then our attacks would surely hit it, and it's passive [Double Attack] is useless.