There's a difference between losing your salvation and walking away from your savior and in walking away from your savior you're walking away from your salvation and if you walk away from your salvation most probably you will lose your salvation. The whole process is Progressive it doesn't happen overnight. I believe what happened to Lucifer and Adam is a great reminder and warning. Just my opinion so don't crucify me, and there's other verses we could look at through the New Testament even though many scholars have coined the epistle to the Hebrews the Epistle of warnings. The whole new testament is full of warnings and commands and imperatives.