The temperature was eight degrees Fahrenheit. The elevation was a few thousand feet above sea level. It had snowed the night before, so the ground was a sheet of ice. Atop Grouse Mountain in Vancouver stood a large drainpipe, which crossed a massive expanse with a three-foot wide walkway on top. The walkway was a hundred feet above a glacial river. The only thing keeping you from falling off the pipe was a very thin, waist-high chain link fence with little spikes sticking out of it. This was OUR SET. And we were gonna throw people off of it -- for pure fun.

Shooting here was all my doing and the safety team was less than thrilled. But the location was simply spectacular and needed to be shared with the world. Like our assassin Karim has repeated each week, this is one of the best crews in the world and they were up for anything. And the director of this episode, Rick Bota, loved the challenge. We only had two days and six hours each day to shoot our entire epic fourth act. We needed to drop two stunt doubles off the walkway into the icy water using descender rigs and that was the easy part. Imagine trying to fit a hundred and fifty person crew on this narrow walkway to capture the most elaborate and dramatic scene in the series. A scope of this magnitude is rarely seen on TV, but we wanted two of the audiences' favorite characters, Cal and Chloe, to have the tear-inducing deaths they deserved.

The legendary assassin was the unfortunate one to break the news to Adam Campbell and Cameron Richardson that they would reach their demise in "Splash." But I was the one to have to explain exactly how it was going to be done. I think all I said to them was, "How do you feel about heights? Oh and also, hanging off of bridges?" Adam asked if he could wear an arctic coat while doing this scene -- I said "No, just the tiny boy sweater you've been wearing for the last few episodes." And he said, "Cheers, that's what I meant."

Adam and Cameron are terrific actors and consummate professionals, especially when they heard the doubles were the ones going over into the water. But seriously, these two had to perform their most intense scenes under extreme circumstances, giving them very few takes with the limited time available. They had to be on their game and as you've seen, they delivered truly outstanding, heartbreaking performances.

After averaging ninety-five separate shots for each of the days, continuously re-rigging the cast and crewmembers to safety harnesses, and launching two stunt doubles off the pipe -- three different times, we killed our two most beloved characters and it was pure fun.