So, I have a small problem. My main character has a close friend, whom he has to leave for a while, in order to go on plotful journeys. That close friend will be mercilessly murdered eventually, and that will be a turning point for my character. The thing is, I don't want to make her (yeah, the close friend is a woman) a walking, talking plot device; on the other hand, I don't want to delay the plot by having them spend time together, because it would get boring. So how can I show that my character's friend has influenced him a lot, without there being much interaction between them?