hmm i don't see noticeable blood, but it's possible.
It's a good idea to have Corid on hand when you have a flock. http://www.amazon.com/gp/product/B00M1UPA6G?keywords=chicken%20medicine&qid=1448478467&ref_=sr_1_1&sr=8-1
It's much cheaper and readily available at farmer's coop or wherever farm supplies are sold.
Also good/normal poo pics below. Watery cecal poos are always extremely stinky too me.
Look very closely at the picture and you'll see lots of mucus, which is not normal.
Zero risk in treating with Corid, so that's what I would do for sure.