Mark Lopa writes:

For the sake of argument, let's say an astronaut conduction an EVA
slipped out of the foot harnessed and started to float away. The only
way to resuce is for the shuttle to undock from the ISS and go get the
astronaut.

This is false, at least for US suits. US suits can carry SAFER for
EVA's, which makes it possible for the astronaut to save himself.

http://nasaexplores.nasa.gov/show2_9...=03-050&gl=912

And how would an astronaut be rescued if this happened during an EVA
with not shuttle present?

Obviously SAFER handles this situation.

If you're using Russian suits, I'm sure you pay very careful attention
to having a secure connection to ISS.

Jeff
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