One observation is not a proof. It just seemed rather strange their expressions were not troubled. I remember suppressed fear on the faces from the Hudson Miracle.
Like this woman?
Crash survivor Keith Yamamoto was holding Loretta Fuddy’s hand in the ocean in an attempt to “calm her down” (his words). It didn’t work, she died of Cardiac Arrhythmia. The stress of falling out of the sky and into the Pacific Ocean can do that to you.
When human beings are traumatized, they often are zombie-like in outward appearance, the panic is internal.