Summary:
The player continues to brush when not aimed at the blocks. The player must stop brushing when the player stops aiming at the block (this is how Java works).

Steps to reproduce:

1. Take a brush.
2. Start brushing the block.
3. Turn around to avoid aiming at any block (while still using the brush).

Observed results:
Are you brushing the air?

Expected results:
When the player stops aiming at the blocks, brushing stops.