Tuskar is the War Boar miniboss with the Purple Mace. Every once in awhile I notice that he begins his attack animation too far from a wall and continues to stay at the distance while stuck in his constant flurry of attacks that don't hit the wall. I didn't bother to dislodge him from that whenever it happened because why would I?
Just remembered this after witnessing it recently. Frosty-Trap meta is the farthest back I remember this from :P