You might have read Aikido and the Dynamic Sphere, which describes any attack is divided into two stages, the dynamic (generic motion) and the technical (form of the attack). Do I get you right, that the pace of the dynamic stage is mostly the same for everyone as well as he or she might be trained?
You're talking about that point at https://youtu.be/gMX8-funYfE?t=19m30s
Thanks in advance and keep it up!
( roughly 3 feet per second) unless one person gets running start