I don]t get what putting someone in harms way means. The student is in harms way in a martial art.
Yeah. I just read that part back and it reads weird.
Let me try to explain by an example. Let us say a student has a wrist injury and we practise aihanmi nikkyo. This could be bad for a 'normal healthy' wrist, but an already injured wrist might be permanently damaged.
When I would intentionally execute the technique at normal speed, disgarding aite's injury and something would indeed happen to the wrist (break it, tear tendons) I would be liable. I clearly disregarded the known injury and put aite in unnecessary real danger. This is not what Aikido practise is about.