Of course he could not affect actual history, but if his presence distorted the Animation, he would not be able to ascertain the truth he sought.
The presence of satellites can distort the true Auger peak and/or small peak shift information due to chemical bonding at the surface.
The human body's presence and density distorted its magnetic environment slightly, so that Slammer could locate it precisely.
The Beeb's presence will simply distort the market, preventing other privately run stations from attempting to compete with the existing providers.
The truth was that the presence of so much magic distorted the space around it.
The Dinkins administration had argued that the presence of reporters would likely disrupt and distort the depositions, proceedings in which evidence is gathered for use if a case goes to trial.
Finally the presence of mature students did not distort Sears overall analysis.
Its presence would only upstage and distort a show as gentle as this one.
It has been argued that a sort of Heisenberg effect is at work: the mere presence of the camera hopelessly distorts the behavior that it means to document.
The presence of air resistance, for example, always distorts the shape, although at low speeds, the shape is a good approximation of a parabola.