If you want to do a headshot with a Anvil, first use a Flashbang. When they lay on the ground You can easily give them a headshot. + to keep this comment alive.
A guy: "O NO there is a guy jumping on a pogo stick!!" Another guy: "Lets walk a little bit less fast as him so he won't hit us!!" All People: "Great idea!!!" Police: "Lets throw bombs on the ity maybe he will stop and go to an other city!!!" All People: "Okay lets do it!!"