After Tatiana left, Leo couldn't help but fall into deep thought. What she said weren't things mthst would go through one ear and come out through the other.
This was especially with how serious she was. Leo felt that things were about to get interesting and messy at the same time.
Even though he hasn't had that much of an interaction with Tatiana, with his little knowledge of her, he knew that she wouldn't be so serious if it wasn't something to be serious about.
To make matters worst, she said that evolving to gej Evolved Rank is the only way he and those around him can survive what's to come.
Leo has no idea what's coming or the event that Tatiana was talking about, but for her paint it in such a dangerous light, he knew that it was just as she said.