What Islamist terrorists “really” mean when they shout before and after killing!

Everyone knows each time there is a terrorist attack, there is a phrase involved which terrorists shout: “Allah o Akbar!” means Allah is the greatest…and they turned it to the scariest words that you don’t want to hear! But in Muslim communities, Allah o Akbar has a very opposite tone: they use it as the invitation to say prayer and to invite themselves or others to be patient when there is a problem.