Camshaft jumped time while replacing timing belt, can't get it back

My buddy and I are replacing the timing belt and tensioner on a 2003 Mitsubishi Diamante (6G74), and upon loosening the tensioner pulley for the belt the rear bank cam/gear jumped time from straight up to about 60⁰ or 7 teeth off from the timing mark on the motor due to compression. When trying to spin it back by hand it jumped the same amount in the opposite direction (which is where it is in the picture). I took the spark plugs out and turned it one more time to try and release the compression but it still does the same thing. I'm afraid to turn it any more since it's an interference engine but I'm not sure how to relieve the compression without the valves touching the pistons (if they haven't done so already). What would be the best way to get the cam gear straight up again?

My buddy and I are replacing the timing belt and tensioner on a 2003 Mitsubishi Diamante (6G74), and upon loosening the tensioner pulley for the belt the rear bank cam/gear jumped time from straight up to about 60⁰ or 7 teeth off from the timing mark on the motor due to compression. When trying to spin it back by hand it jumped the same amount in the opposite direction (which is where it is in the picture). I took the spark plugs out and turned it one more time to try and release the compression but it still does the same thing. I'm afraid to turn it any more since it's an interference engine but I'm not sure how to relieve the compression without the valves touching the pistons (if they haven't done so already). What would be the best way to get the cam gear straight up again?