TÜV or main examination (HU) covered

Hello together, the following problem: My buddy would have had to show his car (no seasonal vehicle) to the TÜV in April 2015 (04/15) or undergo the mandatory main inspection. The vehicle is already registered a little longer (so he still pays his insurance contributions and the tax) in the garage. He will – first because of illness, now due to a longer stay abroad – probably only come in October this year (10/15) the main Unters The car would stay in the garage without moving until this time. Well, what threatens him if he only renewed his HU in October? When would he be threatened with points in Flensburg? I heard something of 8 months up (if so, when would that be? If his car HU had had until 04/15? Many thanks to all the experts