 If this were during combat, when time was short, I could have called for an Athletics skill check to move the horse carcass, instead of just looking at their Strength scores and figuring out how much spare bulk they had to move it around.  If this were during combat, when time was short, I could have called for an Athletics skill check to move the horse carcass, instead of just looking at their Strength scores and figuring out how much spare bulk they had to move it around. 