First of all - use vision control to skate backwards. Then position yourself so that your stickblade breaks the line between the puck carriers stickblade and the pass receiver. You don't have to do anything but be in the right position. Your player will automatically try to break the pass.
To increase the chance to intercept the pass, press L1 (LB xbox) to put the whole stick in the passing lane. You still need to hold L2, vision control (LT xbox), to skate backwards.
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In the first video, are you pokechecking just as the puck arrives or does the player automatically pick the puck up? It seems to me the puck passes through my stick a lot, but maybe it's the settings I'm playing on.
Great tip though
You don't have to do anything but be in the right position. Your player will automatically try to break the pass.