Perhaps in knowing that Nora would have the impetus and abilities to go back in time to protect Barry, his insurance was to cut her speed off, thus allowing him to evade capture for the first time in any dimension (that we know of).
With all of The Flash’s mythology at our fingertips, is it weird to theorize that either David Hersch’s (or Orlin Dwyer’s) Cicada, and not Iris, is the one actually responsible for suppressing Nora’s powers in the future?