Shatter shield removed, phone gets hot

[AC Question]

I want to know if without the shatterproof with the verizon/any sign for that matter it makes the phone non shatterproof. Also the phone heats up a lot especially when I'm using it heavily. Is this normal? Please help Without the shattershield, is my droid turbo 2 still shatterproof? Also what does the bar in the Earpiece do as mine is loose.