def count_collisions(Collisions):
    """
    Counts the number of unique collisions and gets the collision index.

    Parameters
    ----------
    Collisions : array_like
        Array of booleans, containing true if during a collision event, false otherwise.

    Returns
    -------
    CollisionCount : int
        Number of unique collisions
    CollisionIndicies : list
        Indicies of collision occurance
    """
    CollisionCount = 0
    CollisionIndicies = []
    lastval = True
    for i, val in enumerate(Collisions):
        if val and lastval == False:
            CollisionIndicies.append(i)
            CollisionCount += 1
        lastval = val
    return CollisionCount, CollisionIndicies