When Reacher goes to Jeb's place (after "The Auto Parts Store"), he's just wandering around blithely until he picks up the phone - suddenly he puts the phone down, wipes it down, and starts leaving.
What caused the change? He heard the TV playing, but that didn't seem particularly important.
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Philo's Law: To learn from your mistakes, you have to realize you're making mistakes.
I wondered that, too! I guess nobody has an answer?
*****
People said love was blind, but what they meant was that love blinded them.
Reacher wondered why the shower curtains were ripped off so he hangs up the phone to investigate further. It was implied, may be, that the thugs used the shower curtain to cover up Jeb's body when they likked him in his house.
shareAh, I get it - he walked past the bathroom, saw the torn curtain rings, walked on to use the phone, then realized what was wrong with the shower curtain, put the phone down, wiped it, and went back to look again.
Makes sense - I think maybe the pacing was just a bit off or something so I never caught it before.
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Philo's Law: To learn from your mistakes, you have to realize you're making mistakes.
Close but not quite.
The sudden change is when he realized that this was already a crime scene and the guy he was looking for had likely already been murdered as a loose end. He was getting rid of his fingerprints on anything he has touched, like the phone. So that he couldnt be implicated.
I joined the Navy to see the world, only to discover the world is 2/3 water!
I always thought he realized they'd track his phone call from Jeb's place and decided not to use it.
I'll be good I swear... I'll never see a movie ever again.