Training in Top Eleven

[reallaw]

This is a Quote from the TuT
So, if your player has a Defense of 50 and Attack of 30, you won’t be able to improve your Defense until your Attack is at least 31.

That part has a slighty misstake.
You'll be able to train Defense again for 1 Skill Point after spending 1 Skill point in Attack, which would bring Attack to 30.2 not 31