Thread:NaturalFreshOtter00/@comment-2081368-20180922014942/@comment-5932670-20181020150526

Private Sean Gimmestad, the spirit possessing him, his name is revealed to be Rory Kelly or Ruari Mac Ó Ceallaigh, aged 18 at the time of the massacre.

The spirits that Michael controls are filled with anger to respond to reason and can only talk to Michael or by possessing humans.

Rory was killed alongside his mother and sister in the 1825 massacre.

I can imagine he tries to attack Arthur while possessing his body, screaming that he slaughtered his home.