Beholding all Gokula moved with terror and cow-herds and cow-herdesses and cattle stricken with consternations, Hari thus thought "This is the work of Mahendra, who has been offended for withholding sacrifices from me; it is therefore my duty to defend this village of herdsmen. I will uplift this spacious mountain from its snowy base and hold it up as a large umbrella over the cow-pens".

In plain words: Krishna (here called Hari) saw the whole village of Gokula terrified, people and cattle alike. He knew Indra caused this out of anger at losing the offerings meant for him. He decided it was his duty to protect the village, and planned to lift the mountain and hold it like a giant umbrella over them.