Observed a player steal from another while coloring down. My action?

[DrPublo]

5/10 NL last night at Resorts EC. Seat 6 is a total novice with no clue whats going on. He's playing almost entirely in green. Seat 5 is a regular in this game and stuck a few racks. All the dealers and floor people know him by name, nickname(s), and by all the big hands he's won/lost.

Situation: Seat 6 is in a hand. Seat 5 asks if he wants some color to play with and pulls out a stack of red. Seat 6 accepts the stack and tosses over 5 green, still thinking about the hand he's in. Seat 5 looks at the green, then decides to pick it up like nothing happened. Seat 8, friend of seat 5, sees this and starts saying something about "bad karma, bad bad karma." A few hands later he's still talking about karma, looks at the dealer, and says something like "Tell him the type of bad karma he's getting into." I'm in the 10 seat so I can't see the expression on the dealer's face but I presume the dealer saw it as well, as it was a seat 5/seat 6 transaction directly in front of him.

I'm in the 10 seat, not involved in the hand and not wanting to make enemies at the table. Should I have said something?

The Doc