And then yes, they freakin' blew up Theramore. And now the Alliance gets to HELP the Horde reclaim their own city. Not exactly grounds for "fist bumping." "Yeah, we got to set foot in Orgrimmar! Alright! Well, that was fun... Horde, you guys can take it from here."
Undercity was closer to an actual "Alliance fist pump" moment because they went in there with the INTENT to retake undercity. Not some "we'll help the horde because we're best frenemies" crap.