#XRPETF It seems like you're referring to a specific story or context. Without more information, it's difficult to provide a precise answer.

However, here are some possible ways a character might muster up the courage to take a significant action like flinging something into a river:

- *Emotional Buildup*: The character might have reached a breaking point, feeling overwhelmed or frustrated, which gives them the courage to take drastic action.

- *Realization or Epiphany*: The character might have a moment of clarity, realizing that holding onto the object(s) is no longer serving them, and that letting go is necessary for personal growth or change.

- *Support or Encouragement*: The character might receive support or encouragement from someone else, giving them the confidence to take the plunge (literally or figuratively).

- *Desire for Change*: The character might be driven by a desire to start anew, letting go of past burdens or regrets, and embracing a fresh start.

If you provide more context or clarify the story, I'd be happy to help further.