Kill boubech

local ni = peripheral.wrap("back")
local R2D = 180/math.pi
while true do
    local b = ni.getMetaByName("boubechcraft")
    if b then
        local d = math.sqrt(b.x*b.x + b.z*b.z)
        local nz = b.z/d
        local theta = R2D*math.acos(nz)
        if b.x > 0 then
            theta = (-theta)%360
        end

        local ny = b.y/d
        local phi = -R2D*math.asin(ny)

        ni.fire(theta, phi, 0.5)
    end

    sleep(0)
end