Ippon-me

It is important to remember that while uchidachi leads most motions in the kata forms, shidachi is far from inert. In many cases, shidachi's strong seme forces uchidachi to move. In this regard, it can be visualized that shidachi is actually the one who initiates these motions.

For ippon-me for example, when uchidachi (in hidari-jodan) and shidachi (in jodan) meet for the first time in the center there should be a brief pause. This pause is broken by a 'shove' of seme toward uchidachi. Shidachi doesn't move, however the sharp increase in pressure forces uchidachi to strike downward at shidachi's head.

Uchidachi's visualization during this moment of 'shove' is that shidachi is preparing to strike, therefore, uchidachi must strike faster and thus, first. When shidachi steps back, leaning slightly back with wrists moved upward out of harms way, uchidachi's  all-or-nothing strike takes him too far forward, leaving him slightly bent with his bokuto uselessly too far down to continue striking. 

Shidachi then strikes boldly forward at uchidachi's exposed head. He has won, however he must maintain a constant pressure against uchidachi, lest uchidachi get any ideas about trying to steal away that victory. He exerts a downward pressure over uchidachi's head which forces uchidachi to step back, giving shidachi room to lower the tip of his bokuto between uchidachi's eyes, making it amply clear who has the advantage. Shidachi continues to pressure uchidachi until uchidachi takes another half step back, straightening slightly. Shidachi follows this motion in synchronization, pushing pressure forward against uchidachi while moving into hidari-jodan. 

Uchidachi then concedes the match by slowly straightening fully and bringing his bokuto slowly back up into chudan-no-kamae. Shidachi follows this by stepping back the appropriate distance and meeting uchidachi tip to tip.