After the night of the muder, the two guards wake up to find their master dead. They’re instantly accused of killing king duncan and are then executed. King duncans son, Malcmom, is also a suspect as he ran away from the castle. The truth is Macbeth did the dirty deed and the only reason Malcom has ran is because he knows he would be next to die as he was heir to Duncan.
“Here lay Duncan, His silver skin laced with his golden blood.” said by Macbeth, he means that Duncan had a heart of gold. He was nice and humble. Ultimately Macbeth acting out this greif helped with him getting away with the murder.