every 10 ticks:
    loop all players:
        ground state of loop-player is true
        set {_loc1} to block 1 north 1 west of block below loop-player
        set {_loc2} to block 1 south 1 east of block below loop-player
        loop blocks within {_loc1} to {_loc2}:
            loop-block is not water
            stop
        #hacer cosas