Why are my chickens stupefied for awhile when I tap their beaks?

[DearChicken]

My chickens freeze for a few seconds when I tap their beaks. Is this normal? Do y’all’s chickens do this as well?

I just tap the beaks softly and they stop moving. Their pupils dilate/undilate(?) as well.

 

[nuthatched]

Chickens need to adjust their vision for near and far objects, one eye is better for each distance. Their probably trying to figure what touched them since they can't see straight ahead.