Frank was NOT smiling

I've read these threads here about how Frank was "smiling" during Sarah's scenes where she splats. I JUST saw that scene a minute ago. If you watch the film carefully, from the moment Frank is outside of the chopper, you will see he has the same facial expression when Mike Rooker (Hal) comes over on the wire. So it all clearly has something to do with the environment (chopper, wind etc). Of course none of this was real, so he was directed to use those expressions, but it had to be based upon fact/experience.

Gotta admit though, it sure looks odd.