I should also point out that it's not proper to end a sentence with I.... Fzero's sentence should read "5-10 years younger than me." ;) Why did everybody miss this! Uneducated knaves.
If you're looking for explanations don't really go any further than Harb's. I watched the STV rather closely (huge nerd) their fights and strats in engagements didn't really change to such an extent that you could say "what a game-changing tactic" things just started rolling for Flow and mix up couldn't get the train rolling again. I assume that's what most people will find if they do the same. You see this a lot in matches where the simple color switch mechanic can break a team's momentum and even if they're vastly superior (doesn't apply to this match) they'll cough up a few rounds just from that break.
Vhalin pointed out during the cast that it looked like Ruwin changed tactics a little bit on mid - and while Ruwin is a great scout, against a team like Mix Up I think it'd be rather insulting to Mix Up to suggest that that alone could cost them 5 rounds. Things just went flow's way 5 times in a row. (Also not saying Vhalin was insulting mix up)
@ VickM - I'm only a lowly open scrub so I'm sure somebody could correct me.
Warmfront's mid has the same tactical caveats as other maps - if the enemy team survives with several members + medic, you're basically screwed on your own last and will have a tough round ahead of you. The thing about Warmfront is that it's not very easy to know when you need to bail - and then to also execute the escape. This is because the mid-fights on this map happen *really* quickly. You can see it in Pyyyour's (I'm an avid stream watcher - but I just use his name as an example since most meds play this map the same way) play where he kinda has some areas where he chills out around so that he can get more passive as soon as the soldier exchanges occur - or stay in if they go well. Because if you lose mid it's absolutely vital that the med survive. Warmfront's mid more than any other is a death trap for most and it's really tough to not get spotted out, flanked, or chased down while things are happening so quickly.
Also... fuck MLA - Chicago style ftw.