The Time Riders series is all about time travel, changing alternative timelines back into the normal ones. However, in book five we get lots of clues of times when some aspects of time travel doesn’t fit together. [Spoilers ahead]
1. On page 153, Maddy and Sal experience a large time wave together. In this moment everything around them starts to warp and morph, although, what seems impossible in this situation is that Maddy, Sal, and the support units all get sent into an alternate reality. What makes this specific time wave impossible is that the other people don’t get sent into this new reality. As of them stepping out of the time bubble, they have become a short part of the history of that reality. In addition
2. Like one of the laws of conservation of mass says: “Matter cannot be created or destroyed”. This would completely disprove the time travel that is happening in the Time Riders Series. To start off, the time bubble is one object that doesn’t fit in. When a new cycle has been successfully done, all objects should reset, although, but as we know, foster had explained in the first book that all items stay the same and the outside world resets. In this situation, if new money was taken into the archway and then a time warp happens, then matter was destroyed from the first reality since the money went missing and nothing came to replace it. Furthermore, that money would be sent into an earlier version of that time cycle and matter was created in that reality. In other words, you could take money from one reality and move it to the next, working as a method of duplication.
3. We all know time moves relatively, it’s not like one day takes 24 hours but the speed is doubled so it really is going at double the normal speed and then the next day it is slower, it just doesn’t work and doesn’t make sense. Throughout the series, it is clear that Liam is aging very rapidly because of his trips as a time traveler. When he had gone out for the very long trip into the Jurassic age he had aged lots, but if time moves relatively to itself then he either would have aged millions of years or aged as long as he spent in the past. This would mean that if he aged just a few years in that trip then time wouldn’t move relative to itself and time travel wouldn’t be possible.
4. The current theory for time travel is that time-space is bent to make a small hole for people to be able to jump through to get into another time. This would require massive amounts of energy to cause time-space to bend enough for them to even move a few days backward. From all the explanations of the archway, we get to know they have a few generators powered by fuel that is able to power the machine. To this day, people have attempted to create small black holes, these would fail because they don’t have enough mass to form. With their small amounts of fuel, there would be no way they would be able to create a large enough energy force to bend time-space and travel time, therefore disproving time travel once again.
5. The time bubble has many issues to it, including the fact that it is looping a time that would not be available when a time wave would hit. When traveling to a time in the past, the archway’s time is moving relatively, or so it should be. When a time loop happens, the people in the past would be reset, also resetting any changes in the current reality. In this case, they wouldn’t need a team of time travelers and would easily be able to set up a time bubble to reset time when a wave happens.