Loud scream heard by three witnesses. witnessed in McKean County, Pennsylvania

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myself and two others were leaving the woods at dark after being afield bow hunting. the three of us met in a large field on a tractor or roadway that gained access to the fields. our meeting was by accident as we never had plans to meet. we usually just meet back at our car. while walking out myself and the first guy met up and stood waiting for the third person in our party to meet with us only because we heard him walking in our direction thru the field. it was dark and we could only hear not see unless close. any how as we met we all of a sudden heard this loud scream to a gutteral sound to a load grow and heavy breathing. this took place about 70 yds away in a very small patch of woods appx. 30 yds. oval in shape surronded by 100-200 yards of field, in fact i could never figure out why this small patch of woods were ever left standing when most has been cleared for fields. anyhow when this thing made this sound one friend started to run my other friend just froze...