That is, given the preceding context, the player tossed a frisbee must begin a reduced RC, such that there is no local ambiguity.
if comprehenders are making full use of the linguistic context, (1a) should be no more difficult than the other examples, except insofar as ambiguous verbs are harder than unambiguous verbs, and reduced RCs are harder than unreduced RCs, predicting there would be only the two main effects of RC reduction and verb ambiguity on reading times for the tossed a frisbee region.