Summary:
אבימי either expounded the whole מזמור or only the first פסוק explaining that s'ה anger was exhausted after destroying the ביהמ"ק, so the בנ"י were saved. Alternately אסף, who was a descendent of קרח, was pleased when the gates sunk into the ground, so when 'ה will restore the gates, he will also remove בני קרח.
Summary:
ר"ט placed his hands under his mother’s feet, so she would not need to touch the ground, and ר"י was told to allow his mother to wash his feet and then she would drink it up; this too is considered כיבוד.