\- A receiver and their opponent contact each other and both call fouls against the other. 17.H.2 applies, and the disc is returned to the thrower and put into play with a check, with the count reached plus one or at six if over five. - Two different receiver-opponent pairs call fouls -- one against the offense and one against the defense -- while the disc is in the air, but before anyone starts trying to catch it. 17.H.3 applies in this case, even if the fouls occur several seconds apart. The disc is returned to the thrower and put into play with a check, with the count reached plus one or at six if over five. - The marker calls an offensive foul on the thrower during the throw, then later a receiver calls a defensive foul on a defender during the reception on an incomplete pass. The fouls are resolved in reverse sequence. First, the receiving foul is resolved (here, assumed uncontested), granting possession to the offensive receiver, then the throwing foul is resolved (here, assumed uncontested), returning the disc to the thrower with the count reached plus one (max nine). The earlier infraction (offensive foul on the thrower) takes precedence over the later infraction (defensive foul on the receiver), resulting in the disc returning to the original thrower.

Avoid contact in every way reasonably possible, while still playing ultimate. Some contact is inevitable, but players have an affirmative obligation to make reasonable efforts to avoid contact.

A player is not required to hold their position and receive contact in order to call "dangerous play," but the mere possibility of contact is insufficient to justify a call. Furthermore, if the offending player stops or changes their path such that contact would not have occurred, contact was not "reasonably certain."