Why do you think the slavemaster would rather go to the poorhouse than feel that he owed his rescue to a Black man?

slavemaster think that they are more superior to the blacks and blackmen should obey them.

Explanation:

The relationship between slaves and their masters that is the slavemaster (the one who owns slave) is all about the slave serving and obeying all his or her master's instructions and rules. There were several laws guiding the relationship between the master and his or her slaves for instance, laws regarding killing of slaves and more like that.

Slavemaster fell they are superior to the Blackman because to them a blackman is useful only for being a slave and they do not want to be indebted to someone inferior to them.