Thx for answers...... well, when they change the timeline, the New doctor (katarina boyfriend) explain cass that they use a New fórmula for inyection pre-jump what controls better the side effects!
I understand something (I think) about 1) and its that the season 2 its happening in the 2 years that cole lost in chechenia, (or at least they think do something like that) cause when Cole see cass she say that they live a lot of stuff (making reference to the future cole) so, I think in the season finale its coming a reset or something cause its the only thing that make sense....
Obviusly, they can ignore this fact and just continue to other waters, and make the cass watch fix just a mistake without meaning....
In 2) I agree, she have to lie to not mess with the timeline,
