Yeah, by praying or checking watches.
Charging the cockpit, trying to light fuses, belligerent/unruly behavior, these are signs to look out for.
Not thirst, impatience, or faith.
From what I've read, someone overheard the young men say they only had thirty minutes to live.
There have been multiple instances of Muslims "probing" airline security and inflight responses through bizarre behavior.
Not acceptable.