PCs and their influence over other PCs

Another question, courtesy of yours truly.

For example, High Hexecutioner Obsidian has the uncanny ability to discern the motives of others and influence them accordingly. If Impetus were to be subject to this would I be:

Obliged to go along with Obsidian's schemes.

OR

Able to dismiss it as something Impetus would not fall for or be influenced by.