> I don't think worker or drone brood will be damaged unless it is 
fierce shaking.

Beekeepers often strike the end of a frame top bar on a lid or a 
doorstep to dislodge stubborn bees.  It works well, but gives a real 
jolt that is much more forceful than shaking by hand.  That is why we do 
it when bees are clinging and shaking does not work.

Experienced beekeepers often do a "quivering shake" which works well and 
is easier on the beekeeper and maybe the brood.

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