It's the distance IMHO.
You're out on the FW of #18, 231 yds away. AFAIR there's no Starter club to cover that distance.
Also, it's over the long bunker to the left&beach which might collect those low trajectory shots easily.
Didn't try it, but the best chance might be to forget about the green and hit 3WD towards the bunker to the right of the green.