When our Chickadees "freeze" I know a Shrike is in the offing. Then the .25 is called into action and returned to its corner only after the wouldbe murderer has returned to earth.
In Portland, Maine, I witnessed an extraordinary exhibition of a Shrike's impetuosity. They frequently come into cities and towns in winter after English Sparrows and this particular Shrike had pounced upon a Sparrow feeding between car tracks. Before the Shrike's blows (directed at back of the victim's head) were effective, a car approached and passed over both.
Borealis was so intent on his task that I believe he was entirely unaware of the car's passing, for he was hammering away at the Sparrow's vertebrae when the two reappeared. –– All in the day's work, evidently, for the victim soon was beaten to death and its inert form lifted by the shrike's bill, carried aloft, released, caught in midair by the feet, hung in a tree crotch and devoured with much scattering of feathers!
North America from northwestern Alaska across British Provinces to Newfoundland; south irregularly in Winter to Texas, Kentucky and Virginia.