Each Temple has two phases.
In the first phase, upon activation, a large Guardian will spawn and start a timer. Players must remain on the Temple to keep the Temple under their control and to have the timer continue. The timer will only run if a Team has control of the Temple. If at any time your team steps off of the Temple and the Temple becomes neutral, the timer stops. If you or the Enemy Team then grab the Temple, the timer resumes. At two different times for the timer, two smaller Guardians will spawn, making a total of one large Guardian and four small Guardians. The timer will not allow all five Guardians to spawn too quickly, even if your team completely destroys a set of Guardians.
During this phase, you can think of the Temple as a balance; whichever team has more players on it, will out-weight the other team, which means they will gain control of the Temple.
This phase lasts ~45 seconds.
Once the first phase is complete, which is not defined by the death of the Guardians, but instead the completion of the timer, the second phase will begin. At this time, the Temple will charge up and you will see how many shots it has (currently five shots). Once the Temple is controlled by a Team, the Temple cannot switch sides. It is important to note that an Enemy Team can come in and grab the temple just before the first phase ends and steal all of your hard work.
To get from phase one to phase two, you must wait for the timer to complete. Guardians and their death have no impact on the timer's speed, nor do they increase the number of shots nor power of shots. As the timer continues, the Temple will fire for whichever team has control of it at that time.
The top and middle Temple will always activate for the first round. The very bottom Temple will activate for the second round. Temple activation is random from this point further.
After the first two rounds, one, two or three Temples may activate per round.
You are first warned that Temples are activating at 1:15, with a 15 second warning which means it becomes active at 1:30.
If anybody is aware of additional timing info, please place it here, or comment.