Words ran out. What did Arjuna do when he saw the entire cosmos gathered in one divine body? He did not analyze. He did not question. His hair stood on end. He was flooded with wonder. He bowed his head, joined his palms, and began to speak. The body responded before the mind could catch up.
The detail 'hrishtaroma' — hair standing on end — is not decorative. In the bhakti tradition, this is recognized as a physical sign of overwhelming spiritual experience. It is involuntary, like tears or trembling. Arjuna's body is registering something his intellect has not yet processed.
And then, with joined palms and bowed head, Arjuna speaks. What follows from shloka 11.15 onward is his stuti — his hymn of praise to the Vishwarupa. It is the response of a warrior who has seen infinity and found that the only fitting reply is surrender.