Scarce from the ground one foot he sprang, Then stricken fell with deadly pang. Half lifeless, as he pressed the ground, He gave a roar of awful sound And ere the wounded giant died He threw his borrowed form aside Remembering still his lord’s behest He pondered in his heart how best Sítá might send her guard away, And Rávaṇ seize the helpless prey.

In plain words: Maricha leaps once and falls, dying, with a terrible roar. As he dies he drops the deer form. Still loyal to his master Ravana, he plans how to make Sita send her protector Lakshmana away so Ravana can capture her.