Dais nods to Eshe'ri and continues to sing his sonf continuing to inspire viw his voice alone, as he draws his bow, and readies an action to fire at anything that comes through the door that does not look like a Sentinel or Page.
[Note: Dha'thuran used a movement action to ready his bow, and then a stadard action to fire a single arrow. You aksed for a full action with rapid fire, but this wouldn't have been possible until your bow was ready. Your bow could have been readied as a free action, of course, but only if combined with a move. Please let me know if I am in error on any of this.]
