As you were wandering in the dream world to get rid of your emotions to obtain the GHOSTWALKER, you came across a forest, with purple trees, and it was BEGGING you to leave, by putting signs, turning itself into an arrow trying to force you to leave.

One of the trees became something, FEAR..

"P-P-PLEASE! YOU HAVE TO L-LISTEN TO ME! I-IT'S USING Y-YOU!"

It was talking about Builderman..

You saw that it was shaking in fear, which made you feel guilt that you have to kill it in order to obtain what you want.

It seemed completely horrified like it wanted you to just leave it alone.