How blitz works?

We had 3 bases, 1480 points, they had 1 base 1460. Suddenly all our 3 bases disappear and they won. I mean this is happened at zero rating. So, i assume there is a strategy here that better players know to avoid losses like the above.
But for me this system is really cumbersome and none gives directions, so everythng is a mess. Especially when the bg is large.
I dont enjoy it. I feel that i dont know where to run, as a healer. I may find myself healing in a node where flag suddenly changes to untouchable and the whole battle there was a time waste. Is there a pattern on this how it works and what should one do?

This will bring you up to speed.

https://m.youtube.com/watch?v=Qe-GmWnA4Xo&pp=ygUPUmJnIGJsaXR6IGd1aWRl

Blitz BGs have a different ruleset.

Recommending the vid above. Watch it completely.