answer:”...the friendship dynamic…” Each “friend” casts a unique perspective upon what that actually means. Your question, seems to slant in a direction of a friend that would “avoid” responsibility. I suggest, from my perspective, that such a person was never a real friend in the first place. A real friend accepts responsibility, perhaps even to a greater degree than what they are actually accountable for. A false friend runs like a cockroach when the lights are turned on.