^ This is happen to me
I have missed a shot a liquid, and retrieved a part of it, and shot it again even though it had blood in it. But within a few minutes.My theory is tha the blood doest coagulate as fast under vacccum, though ive heard of people using shots with blood in it that has be sitting around for hours. I dont know how safe it is to do this. If you do it withing 5-10 minutes max it it probably wont hurt. Im not sure how bad (if at all) it is. But some people throw them out if that happens.
Is that what your talking about in your other post?