If you hunt long enough this is going to happen whether with a bow or rifle. What is positive is the fact you are making an honest effort in harvesting the animal. Provided the fact someone else has seen the animal moving around it appears safe to say it is going to survive. I wouldn't punch my tag with the effort given by yourself and the information provided by halflife65. If anything, take him up on his offer and go in for a second attempt on the same animal. Either way, I would not give up archery based on this situation. This is a situation of circumstance and not the equality of equipment. Keep up the hunt and in the end chalk this up to an experience. There is a huge difference between the effort you are making apposed to someone who simply moves on to the next animal.