Another great episode that is well covered in comments below... cept to note Merles exceptional ability... and that is making enemies and influencing people.
Regretfully his influencing skills seem to constantly center around harrassment, tortore and assault!
His persecution and persuit of Michonne already made him one enemy I would not like to have on the loose and then... well, Glen doesn't seem like the sort of guy that has a "sh*tlist" and he's pretty much a live and let live sort of guy.
Merle can't seem to help himself and "pokes the bear" - even after Glen told him that the past months on the road had toughened them up... so once again Merle seems compelled to put it too the test - and what did we see?
One of the most kick*ss one on one zombie vs. survivor fight scenes of the whole series! Go Glen!
Geln has gone from "street smart know when to fight and flight" to upgrade back against the wall do or die dude!
So, Merle, seeming to not recognise that Glen is not the sort of guy to overlook what has been done to him and his gf, shows a large degree of arrogance and still thinks he has the upper hand - dang Merle! Get rid of this guy because now you have two implacable enemies still alive and kicking - take the shot!
Further on down the track poor old Daryl, who obviously won't want to see his bro ganked, is goning to have convince two (three) super angry foes that Merle shouldn't be summarily executed...
Looks like some interesting dRAMA IN THE WINGS!