A mountain lion kill really isn't as messy as you'd think.
Here at this link is a left over kill from a ml and its just some fur and bones. No blood or anything. If this ml had finished his whole kill there would of been nothing. No blood or anything. And its actually very rare how this ml left its kill. And if a ml has cubs she will hunt within her home rang and bring the food back to her cubs. A ml home rang is huge and a ml will usually run up to 10mph
http://custercountynews.com/cms/news/story-605263.html
Research has shown that mountain lions actually consume their kill with methodical precision and leave virtually no blood behind. The cougar drinks the blood for the nutrients it provides. Here's another great sight:
http://www.mountainlion.org/CAL_ch4.asp