Gideon Jura vs an opponent with multiple combat phases
Gideon Jura creates a requirement that they attack him if able.

In the second combat step, Gideon Jura is no longer around and able to be attacked, so they have no need to attack him. The player may attack freely, including you directly or any other planeswalker you control. They may also not attack at all since they have no  more requirement to do so.