Reality Isn't Like On The Telly

It seemed simple. A walk down by the river; I'd drop behind slightly, pick up a rock. One swift blow, then back to my car and across country. No-one knew I was here.
It wasn't like that.
Evolution knows. That bland, easy target is where the bone is thickest.
There was no gentle falling into the water.
There was stumbling, screaming.
Falling on knees. Slumping to one side, showing me something raw and pleading, scrabbling terror over bloody stones, the rock still in my hand, I have to finish this, but not the face, not the face, not the face...