Rigveda Book 8 Hymn 1 mentions the following:
11 When Sūra wounded Etaśa, with Vāta's rolling winged car. Indra bore Kutsa Ārjuneya off, and mocked Gandharva. the unconquered One.
12 He without ligature, before making incision in the neck, Closed up the wound again, most wealthy Maghavan, who maketh whole the injured part.
13 May we be never cast aside, and strangers, as it were, to thee. We, Thunder-wielding Indra, count ourselves as trees rejected and unfit to burn.
Wiki gives the following information about Kuts:
Kutsa is mentioned in the Vedas in 40 to 50 different contexts. Kutsa asked Indra to help in decimating Ruru's enemies. Indra invited Kutsa to Indraloka to celebrate the victory. Rig Veda 4.16.10 mentions a conversation between Sage Vaamadeva and Indra, which indicated that Kutsa and Indra were friends who resembled each other so much that at one stage, Indrani herself could not differentiate between them.
I want to understand what exactly is happening in this story & if it is described in more detail elsewhere. Are Etasa and Kutsa the same guy and what was Vata's rolling winged car? Who was the Gandharva whom Indra mocked by taking Kutsa away and did he heal his wounds or cause them?