What would humans actually experience during a Phrase Transition?
Well firstly, you would experience nothing. It would happen so fast that you wouldn’t even realize it happened. The front would move at the speed of light at least. (Inflation was a period of expansion where the expansion was greater than the speed of light (See Horizon Problem) – this is an event of similar magnitude) and would consume every human an object in the universe before a human brain could process something was happening. The whole universe could consumed in 10^-10 seconds or less. If you could experience the phase transition here is a brief summary of what would happen. A microscopic location in space would undergo the phase transition. It would bubble (an approximation of the effect) and slowly crystallize surrounding points in space. Nearly instantly, each of those points would crystallize and spread outwards. The universe spanning from the new bubble would be a new universe with completely different laws of physics and forces.