fighting raged in as forces try to hold off the isis siege there. i have to warn you, you may find some images disturbing. >> from inside kobani, the day's ferocity gets no respite at night. a prize so small but so valued that violence seems to swallow it whole, grinding its streets down to the bone. >> we're headed to the frontline where nightly, daily, isis hopes to advance. a kurdish female fighter is this unit's commander. coalition air power did this, pushing isis back. they abandoned their dead as they retreat. the decaying smell haunts these frontlines.