Pass Interference

[Ed Maeder]

I would like to get others take on rule
7-5-10b.
"Any player hinders an opponent's vision without making an attempt to catch, intercept or bat the ball, even though no contact was made." I was told that defending by putting your hands in the air they are not hindering the opponent's vision. I feel they must be making a play on the ball to catch, intercept or bat the ball. Am I wrong here?