Nothing in rules about the holding hand being stationary. In fact i would believe it rarely is
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Laws of
Australian
Football
2013
1.1 Definitions
Handball: the act of holding the football in one hand and disposing of
the football by hitting it with the clenched fist of the other hand.
15.3 Free Kicks Relating to Disposal of the Football
15.3.1 Correct Disposal
A Player Correctly Disposes of the football if the Player Kicks
or Handballs the football.
15.3.2 Incorrect Disposal and Payment of Free Kick
When the football is in play, a Free Kick shall be awarded
against a Player who hands the football to another Player
or throws the football.