I'm currently trying to beat this, so I'm keeping the playthrough on hold. Is the soda supposed to push Baldi back? I kept using it on him and it just goes through him.
Yeah, but it works best in hallways, otherwise he often gets stuck on an object and then can't move back further. One thing worth mentioning though is that the BSODA allows for some movement, just slowed down, which does allow NPCs to slowly trudge through it, but I might get rid of that in the future. So, as of right now, it's more effective on Baldi when he is slower.