If she was pushed by him he presumably expected her to die and he would get away with it.
She is alive and could tell the police he pushed her.....even if he didn't!!!!!!!!!!!!
The phrase “bricking it” is British slang, used to describe intense fear or anxiety. It likely stems from the idea of fear causing a loss of bodily control, metaphorically “producing bricks.” This colorful expression has its roots in working-class slang, and though there isn’t a precise origin date, it has been in common use in the U.K. since at least the mid-20th century.