When Lukas fell over in Episode 5. That scared me. Join the club. My OTP almost died!
And every time Petra spoke when she was withered. Anything could've happened. More like any time she was onscreen when she was withered. Telltale doesn't do off-camera deaths (Really? I had no idea. I'm new to Telltale.) , so anytime she existed on camera was a time when she could die. What does speaking have to do with it anyways? (Idk? I guess she just sounded super weak?) "Hey, guys? I'm going to die now." XD
Responses in, uh, non bold.