The rock who wins a big pot and immediately locks back down is more dangerous for the next orbit than he was before. He's not loosening up - he's protecting.

Why they do it

Winning rocks at $1/$2 get more conservative after a big hand, not less. They got what they came for and now they don't want to give it back. Their ranges tighten even further and their aggression disappears. Don't try to run a move on them right now - they're folding their way to comfort and they're fine with it.

The adjustment

Leave them alone after a big win. Pick on someone else. Come back to them in an hour when the protection mode wears off and they start leaking again.

What it's worth

Trying to bluff a winning rock who just locked up is burning a bullet on the wrong target. Save it for someone who's actually making mistakes right now.