October Novel Prep Challenge

A few days ago I was going to post and ask for suggestions on how to get un-stuck on writing my synopsis. I'm trying the snowflake method this year and was stuck for a good week with a one paragraph description that I didn't particularly like and a synopsis that wasn't going anywhere. The reason I didn't ask is because while I was waiting for the page to load I thought 'what if I write it for the antagonist instead of the protagonist?' A lot of what the protagonist does in in response to the antagonist's actions, and I had no idea what he was doing. It ended up working surprisingly well and in less than an hour I had a synopsis for the antagonist that I was quite happy with and re-wrote it for the protagonist.

Has anyone else had a similar problem? If so, how did you solve it?