you never said in your original post that you had your opponent on two fouls but anyway, heres what could be a probable layout for you should he hit the seven...............
because the shot i would be left with could be a tough combo my suggestion would be to clip the seven using a bit of inside english, bringing the 7 down the rail to hit the 9 slightly, playing speed off the side rail to leave the cue behind the eight/nine. this is a better shot imo because it leaves a harder reverse english kick for your opponent and the leave you will be left with should he make a good hit will be more predictable and spread out for your next shot if need be.
because the shot i would be left with could be a tough combo my suggestion would be to clip the seven using a bit of inside english, bringing the 7 down the rail to hit the 9 slightly, playing speed off the side rail to leave the cue behind the eight/nine. this is a better shot imo because it leaves a harder reverse english kick for your opponent and the leave you will be left with should he make a good hit will be more predictable and spread out for your next shot if need be.