Question about 2nd half spreads for NBA games

[td1234]

Team A is the home team
favored by 4 (entire game)
down by 3 at halftime

What's the second half spread?

Team A is the home team
favored by 4 (entire game)
up by 2 at halftime

What's the second half spread?

What if Team A was favored by 8, 12, 16.?

[rm18]

3,3

9,7.5

11,8

12.5, 10

[Reload]

It varies a lot. Every game is completely different.