if you flick/swipe left or right when the closedhand option is visible
in Android, you simulate scroll up/down.
example scenario at opponent's turn with a spell on the stack, swipe
down to interrupt then do something, if you open a zone like library or
graveyard or exile and you want to interract from the zone there (like
casting spell or doing ability from that zone, you can flick left or
right to close that zone so you can tap for mana or any other extra
costs for that spell, you can open the zone if possible just by tapping
it like it used to.)
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