I would rather spend extra 5-10 sec when preparing to lift heavy ass deadlift rather than injuries. 

My form is just the same as yours, and I would say it's good 

Do you guys feels cold at some particular environment?

To describe myself, I am skinny as my arm and bicep almost same size, need to flex only can see the big difference.
Leg is as thin as flamingo, like a stick.

I feel that I am having a very low fat percentage too. Maybe due to walk/jog alot, burned most fat away, will feel very cold when swimming/wind blew.

Building muscle is great, but is it possible without burning that fat away?

Thats what I felt, always very cold because lack of sufficient fat.

My last sentence mean that: Is it possible for a person to body build but does not burn the fat away?
Since to show pure muscle you need to cut the fat away.

This not approve, what if built muscle on hands/legs but hands/legs still have fat?

If can then bagus

Maybe should try to just shred the muscle in bicep without interrupting the fat at top level..

owai... what am I even talking?

Want to gain muscle because can use some strength out of it, can look good also...
Want to gain fat because protect from cold, good to cuddle...

The list goes on...

Better eat at maintenance then.