According to Osho, Arjuna did not and could not see himself being consumed in Krishna’s terrible cosmic form. One can only witness others’ deaths; the inner witness never beholds its own dying. Arjuna, as the drashta—the seer—remains outside what perishes. Bodies fall into the mouth of time, but the witnessing consciousness stands apart, untouched and deathless.
You can’t watch your own death, so Arjuna saw others dying in Krishna’s vast form, not himself.