Between who though? Normally one would think between the people and the army, but in this case the army has little love for the ruling political party and will likely not intervene to protect it. I guess things went bad so fast people , after already having a protest, went to the limit this time.
That's what come's from having an election so soon where the only people ready were the Muslim brotherhood. Only a third of Egypt is Muslim and even then not all of them want to live under religious law, of course the pro-Islamic laws and poor economy caused people to revolt.
This is the Game of Thrones
Where you either win
or you DIE