"Challenged, I would never turn back" even this was the vow taken by Arjuna. The son of Suta should therefore have summoned Arjuna in battle.
आहूतो न निवर्तेयमिति तस्य महाव्रतम्। स्वयं मार्गयितव्यः स सूतपुत्रेण फाल्गुनः॥