I believe the following gives the answer.
Specifically where its says "TuGs with any bases that are charging lancer or devastating chargers must make a forced charge
at enemy TuGs (except flexibles in SuG form) within 3BW directly ahead, unless they are themselves missile focused."
My bold emphasis.
It says the forced charge must be at the triggering TUS(s).
The charge can, however, also wheel as per:
SP 2.3
Therefore, IMO, combining these whilst you can choose the direction the charge must still be hitting what triggered it.