the shot looks like a giveaway to me, even on a 12 foot snooker table, I dont see how the line diagrams or the childish arguments would help a new player, probably best to just practice a little. usually if they don't sink the ball its because they didn't hit the cue ball quite right. and they over cut or undercut it a little or applied the wrong spin.
if the shot was difficult , they would have the option of hitting the ball to point C with some bottom, to park the CB on the rail somewhere near point C and leave the OB mid rail on the cushion , opposite end. that requires being sensitive to the speed and amount of bottom and is less about aim. both rails are about 4-6 feet long so it's a big target.
there are other ways to accomplish that, cut it thin enough that the ball hits the rail and then bounces to the end and that would leave mre energy int he CB so it can make it back to the other end. to learn that they need to understand how the cut angle will change the speed of both balls.
the opponent would probably try to do a long bank with a lower than 50% chance of success , but on a little diamond or some other kids sized table or a bar table made for drunks, maybe the long bank is a lot easier, then it may be better just to make the shot.
if the aim is to help the green player it might be good to watch and see, if he's constantly over cutting the shot then correct it, or it may be a lot more to do with posture and stroke.. So beat him and smile and have have another game or set up the shot a few times and help him with his aim.
most new players already know their ABC's and no one starts out with experience so discussion around what letter you think they are is just Irrellevant judgemantal and insulting anyway.
sure explain ball induced throw if the person can receive that info, if its too much, just lighten up and let them practice more.
Also no harm in resetting the balls and letting the player try ten times, I bet in 1/2 hour the ability changes and the percentage of missed shots is reduced. if they still miss put the 5 nearer to the pocket, build confidence. then move it further.
repeating the shot and looking for why the player keeps missing is helpful.
i found the line drawing just confusing. I guess you are trying to compensate for throw through some graphical representation..
no mention of what spin he used , that will affect the throw almost as much as how he hits the ball.
i guess one could be taught tohit every shot center ball and compensate for throw with aim, but without understanding how to use spin they wont get far with CB placement for the next shot so won't help them run many balls. you'd be sending rhe 5 to the corner with spin caused by the impact and compensating with aim. how about helping him notice how much spin the collision is putting on the 5 and help him compensate with a little left english so he can roll it in without causing the 5 to be spinning between where it is and the pocket. ?
with either approach youstil have to understand that the spin will affect things. before the shot how about ask him where he is going with the CB? help him to control that so he can hit his predicted target. with that he can make the shot and have some decision where he's going. without understanding spin, he might make the one ball. he'll have little control over the placement of the CB. that shot leaves a lot of lattitude as to where the CB ends up.
a good excercise is to make that shot with both right and left english and show the new player how that will help him control the CB when he mkes the shot. If thats difficult, put it closer to the pocket so he isn't losing confidence. you can toss a random ball anywhere on the table and get him to try to make the ball and hit that loose ball. he'll need to use english but having a target in mind helps more than just making a simple shot, if the point is to learn from your excercise. I think the main thing tht will be lerned by that is that after the collision with the 5, on the first rail they will see how spin directs the CB and start learning how to control that to their advantage.
you have to take the persons skill into account, I know people that could never wrap their head around the theory, especially if they are new and learning and a bit overwhelmed already,,
some who are more technical grasp the physics a lot more easily. the person lacking the technical can often still learn ot make balls quite well.