West thought about this and then stuck his hand up.

"Professor, I think aside from eye contact and concentration, and for some people actually saying the spell to actually do it, it'd be easier if you'd sort of...." He hesitated, "got under your target's skin a bit. Done something to make them more susceptible to mental invasions." Did she understand?

"Like.... taunting them. Or ... said something what preyed on their fears and insecurities. Things that make them panic or.... you know, lose the concentration needed to actually fend a mental invasion off if they actually knew you were doing it to them. My dad says some people sort of have a natural mental shield, like they've got a mental wall made up of bricks. Some are higher than others and therefore naturally are harder for the Legilimens to break through. He says if you learn Occlumency it works like mortar, filling in the gaps between the bricks, and holding your mind together so that no matter how much the Legilimens tries to break through, they just can't unless they figure out a way to be tricky and undermine your mental foundations.... like how I said about taunts or preying on their fears and emotions and whatnot." West offered his take on it and put his hand down again.