mPCR result discussion

Ray came to our lab and ask for some sheep blood, and also asked if the mPCR result is right as being expected. As the result shows that the swabs MedLab gave me were NOT pure-cultured and there were several different species in one swab, I wondered why Ray told me I didn't need to isolate another pure culture. However, Ray said those non-pure-cultured swabs were "understandable"?! What the earth does he mean??