It's been two weeks since Devotion received that letter, since Victor and Alex set out with Dreven Krauss, and since Aldrin began his plan.
During this time, Aldrin had been in constant contact with Dreven Krauss, keeping him updated on where Devotion and his companion were, as well as any movements they made. Fortunately for Dreven, they didn't seem to be moving or even fazed by the letter Aldrin left them.
Aldrin, on the other hand, was fuming. They had completely ignored his warning! If Devotion died to Dreven's forces and not Aldrin's blade, it would form a heart devil that he would never be able to cure. His very honor prohibited anything like that. He wouldn't stand for it. However, there wasn't much he could do now. Both his and Devotion's fates were out of Aldrin's hands now, and into Devotion's. Whoever lived and died would be up to him.