What am I supposed to do with Focus?

It looks like he's eating something very tasty.

Maybe you could use a piece of his meat somewhere else in this episode.

You need to get his meat.  But it might help if you had a bit of 
seasoning that you could use to make it taste better.

Or mayonnaise.  Put it on the meat (W).

Now notice how the guard lowers his meat a bit.

You can then use the lowering of the meat as an opportunity to take it.