Or HaChaim on Exodus 10:6/אור החיים על שמות י׳:ו׳

1 ויפן ויצא מעם פרעה, He turned and left Pharaoh's presence. By not asking permission to leave Moses demonstrated his lack of regard for this king who had once again reneged on his promise even after he had proclaimed: "G'd is righteous and I and my people are sinners." Actually, the wicked Pharaoh repaid Moses for this slight when he had him brought back to the palace unceremoniously in verse 8. After that Pharaoh expelled Moses from the palace in verse 11. He was aware of his lack of deference when he begged Moses to pray for him again in verse 16 adding: "I have sinned against the Lord your G'd and against you." He had never previously apologised to Moses, only to G'd.