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"The energies of time enveloped both Henkka and Alex at the same time. Alex screamed. A part of the fabric of time was torn. Events from the past and the future were mixed with each other, memories of things were gained and lost. Years bypassed Henkka and Alex. The hallway they were in became a blur, everything fading from their view. Then, with a burst of power and the fabric of being rearranred, the two time travellers flashed away, to a fate unknown.
"
— Narrator
The Time Fracture was a disastrous event caused by Henkka and Alex simultaneously changing between timelines while touching each other. This resulted in a tear of the fabric of time, allowing past and future events to mix for a short time. This event is a hypothetical and non-canonical explanation to the abrupt end of the BZPRPG 2011 arc and the beginning of the new Arc 1.
Prelude
In the BZPRPG 2011 reality, Henkka and Alex both ended up within the same timeframe during their time travels. After long individual adventures they met up in Xa-Koro and battled each other. They both achieved the quest they were there to do. Henkka prevented a Matoran named Zoma from joining the Makuta while Alex succeeded in killing Tapio. Having completed their respective tasks, Henkka and Alex began the transition to new times and new quests.
Summary
In an effort to prevent Alex from leaving, Henkka threw himself at him and held on even as he began his own transition. This resulted in a fracture of the fabric of time. Past and future events mixed with each other, resulting in a complete reshaping of the known reality and history. Some events changed their places in disastrous ways. Many dead beings were brought alive while many also died.
Aftermath
Henkka and Alex were transported to the same timeframe again, only this time in a very different reality. The fracture of the fabric of time mended itself as an automatic reaction to avoid destruction of time itself.
Behind the event
This event was created by Toatapio Nuva as a response to the cancellation of the BZPRPG 2011 arc in order to wrap up Henkka's and Alex's story in that reality. This was also a gateway for him to continue their adventures in the new Arc 1 plot.
The BZPRPG 2011 plot was finished by Toatapio Nuva and some other old players as an independent story. Although not an official explanation to the change of arc, this event does not contradict with any other idea or plot, and holds no influence in the world of the game whatsoever.
Although the event is considered an important part of the HT Adventures story and that of Henkka and Alex, it has been declared non-canon by the BZPRPG staff as the possibility of time travel was retconned during Arc 2.