Bricking your phone is a term that is misunderstood. I will try my best to explain it and hopefully someone with a bit more knowledge on the subject can elaborate more.
A Bricked phone is unusable. It cannot not be flashed to or fixed with a piece of software. A Few things can brick the phone:
1. A Bad Radio Update - Or an Interupted Radio Update.
2. A Non Volital Memory error. (Seems to be the bootloop of death)
3. An Actual piece of hardware that is needed at bootup.
I'm sure there is more however this area is not really my expertice and these are my understandings.
A Bricked phone will never get out of the "Splash" Screen. It will either stay there forever or it will continually "Loop" It never makes it to the software.