1) Samus' Speed Boost takes time to charge. She has to run for a few seconds before the booster charges up and fires. However, once she's running full speed, if she hits Raziel, it would be pretty natsy.
2) Raziel's TK still might be able to halt her speed-based abilities. She might not be able to achieve full Speed Boost at all if he uses TK Grab or Stasis Field. Plus, If she's in Morph Ball form, she'd probably be easier to toss around with TK, considering the giant decrease in size, mass and weight.
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