I like three choices. Drop and eat dirt, a band-aid boo-boo beats a hole. Move or roll then. Second is what I call the hot pavement hopscotch. You jump, hop, skip as you wish toward the shooter. Left, right, up and down while agressively closing the gap and acquiring a sight picture. The third is a simple modification of Isosceles. Turn and extend your stronghand with weapon to the shooter and acquire a sight picture. You present only one side and thus, less target.