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Shimizu Sensei doing Kodachi no Ran-ai (Kuroda Sensei is uchidachi):
http://www.youtube.com/watch?v=r5PoK9BArWw

/Steven

精神 = spirit / soul / mind

So, Karate-do no Seishin (空手道の精神) can be read as "The Spirit of Karate-Do"

All the best,
Steven

Perhaps these videos of Uehara Seikichi Sensei (Motobu-ryu - Udundi) wielding a katana might be of interest:

http://www.youtube.com/watch?v=UkRkzOPc5Bs
http://www.youtube.com/watch?v=fmUEDqqj8hQ...