"We knew that they would probably go after someone"

In this quote, Jon Johansen is revealing a sense of anticipation and understanding. He and others knew that a particular group or individual would most likely target someone for some reason. This could be due to previous experiences or patterns of behavior. Making use of "probably" recommends that it was not a guaranteed certainty, however rather a strong possibility. This quote likewise implies that there may have been a sense of risk or threat involved, as the word "pursue" can have negative connotations. Overall, Johansen's declaration conveys a sense of caution and preparedness in the face of a prospective threat.