should i speak up or keep quiet

[Mikey]

I witnessed this in a hand at the poker table at the Tropican in AC.

I'm not involved in the hand but the player to my right is.

3 people were involved in the hand and the player to my right is in the middle of the action. We'll call that player JOHN.

Now this is what happened.

On the river Seat 1 bet out(an elderly lady), John was in seat 5 and called.
Seat 10 raised, Seat 1 reraised, now the dealers head is on a complete 180 degree swivle, back and forth watching seat 10 as he raised and counting out his chips since he didn't put in enough, now the dealer looks back at Seat 1 (an elderly lady) who reraised and then back to seat 10.

As her head is going back and forth Seat 5 (JOHN) grabs his chips back and folds his hand. He takes his chips and puts them back on his stack and flicks his cards towards the dealer.

That money that he called with on the river shold have obviously stayed in there and I'm the only one who saw it.
I wanted to say something, but I didn't.

As I watched the elderly lady stack her chips I felt bad but I didn't say anything since the pot was now $15 short.

I wanted to say something but I wasn't sure if it was my place to say it.

I think i did something wrong.

What do you think?