Comparison of American football and rugby union
A rugby union game is divided into two halves of 40 minutes (or shorter for lower-grade games, and breaks given halfway through each half if playing conditions are considered to be extreme) separated by a half time period of up to 15 minutes in an international match. Most notably, a rugby union game will continue after the scheduled end of a half (half-time or full-time) until the ball becomes dead - any occurrence that would have play restart with a scrum or lineout, or when a team scores. This has led to some "nail-biting" finishes where teams losing by only a small margin work their way towards scoring, and games can go on several minutes over time. Something similar can occur at the end of either half in American football, though usually for only a few seconds of additional time, because a play that begins before the half expires continues until the ball is dead regardless of whether there is any time left on the clock. In both sports, the clock is also stopped during substitutions and for injuries, so the referee does not need to add stoppage time as is done in soccer/Association football. American football games are made up of four quarters of 15 minutes each (less at the high school and youth levels), but the clock stops and starts according to specific rules, so that a 15-minute quarter lasts much longer.
Stunt (sport)
Game
Two teams will compete Head to head, involving four quarters and halftime. Halftime is in between quarters 2+3. 
Completion of a Round
This part shows that each round is finalized after the round is scored and announced.
Halftime 
It is a pause of 10 minutes that is given in between 2nd and 3rd quarters of a game. 
Head-to Head
A competition including two people or teams with a similar routine on different sides concurrently. = 
Neutral Zone
It is a midpoint or borderline. The neutral zone is where the officials stand and is defined by 4”extensive white Velcro strips which distinguish the area from proximity mat sections. 
Practice Mats
Practice mats consist of two mat sections and their extent is 6 feet by 42 feet appropriate to teams for warm- up areas in juxtaposition to their team bench.
Quarter Break
Quarter break only consists of two minutes breaks and each player takes in between quarters of play. 
Round
It is duration of time and each team decides 6 pre-arranged procedures for performing. The rounds are divided into three part including quarters 1, 2 and 3. The 4th quarter is related with the performance of each team and involves one round. 
Routine Call
The team with possession will decide the routine which is performed in a certain round.
College STUNT Association/STUNT Handbook/ “STUNT Resources” 2012
http:// www.collegestunting.org. 1 Feb. 2012