There was a scene that we shot where I was repelling into the lake, he recalls.
Would you do this?
It was one of those things that when we first started, you just kind of went with it.

Credit: Parrish Lewis/NBC
It just felt really, really bizarre and silly.
With 99 episodes under his belt, the uncertainty is no longer an issue.
Ive been around it for so long and a lot of our friends are firefighters, he says.
A rescue in Lake Michigan in January stands out as something that I dont think I would do again.
I think I would find some weird ailment, he says.
You have to realize were doing that maybe 20 times.
The 100th episode ofChicago Fireairs Tuesday at 10 p.m. Watch our full interview with Kinney below.