No one said hunting demons was going to be easy!

On this week's all-new episode of Shadowhunters, Clary, Jace and the rest of our favorite underworld fighters teamed up against one their fiercest foe yet -- and only ETonline has the exclusive scoop straight from the cast about how they filmed the "intense" scene!

Facing off against a memory demon already seems like an impossible task, but star Emeraude Toubia says the cast had to overcome different kind of challenge to shoot the moment: "You're basically acting with your imagination because there is no demon there," she explains.

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So how did the creative team at Shadowhunters conjure up the demon? "We had a lot of moving parts and it was actually very interesting the machinery they put together to create that light effect," Matthew Daddario divulges. "The memory demon is coming out of this vortex, so they created this swirling gel with light in the center."

Katherine McNamara adds that the set was filled with smoke and wind during the climactic scene. "Jace, who's the character who is the strongest, gets taken into this vortex," she reveals.

In order to achieve Jace's high-flying stunt, Dominic Sherwood spent "a couple of hours on a wire" high above the set.

"[There was] a lot of screaming and a lot of keeping my core muscles very tight to keep my body at the angle that it needed to be," Sherwood dishes. "It was physically and emotionally very challenging but what's life without a challenge? That why I do what I do. That's why I love doing this type of stuff."

Shadowhunters airs Tuesdays at 9 p.m. ET/PT on Freeform, the new name for ABC Family.