To Anonymous User,
Once again, if the technique is a throwing technique, you can minimize injury by following the flow.
To learn to follow the flow, the most essential thing you need to do, is look where you go. Expand your horizon , keep your head level and look far away at the direction your nage direct you to.
Your head can not turn to other direction, it can cause instability easily, you will lost your center and posture. By looking at the direction where the nage direct you to, you can easily regain your posture and stability.
Follow the flow and take ukemi, your problem will be over. Take ukemi without follow the flow, you are asking for trouble. So blame yourself, not the fighters if you don't know how to save yourself.
In a dojo, there are bound to have all sort of fighters, some pretend to be a lover. To run a way is not the solution, aikido never ever teach you to run away, aikido teach you to confront with the problem by applying non-resisting principle.
If you need a good book to read about, go and search for "Aikido Inside Out", this is an online book, the author is one of the very few who understand about principle of non-resisting. Forget about harmony, there is no harmony in dojo, there are always funny people around to make your life difficult.
Learn the non-resisting principle by following the flow, you will become undefeatable, so where is the injury?