Handle TryCatch inside a function example, for nested throwing?? If there would be any reason to do this??

NestedSnowballsThrower.cs

using System;

namespace ConsoleApplication1
{
	internal class Program
	{
		public static void Main(string[] args)
		{
			NestedCatching<SnowBallException>(ThrowSnowball,
				() => NestedCatching<SnowBallException2>(ThrowSnowball2));
		}

		public static void ThrowSnowball() => throw new SnowBallException();
		public static void ThrowSnowball2() => throw new SnowBallException();

		public static void NestedCatching<TCatchException>(Action unsafeAction, Action? onFail = null)
			where TCatchException : Exception
		{
			try
			{
				unsafeAction();
			}
			catch (TCatchException)
			{
				if (onFail is null)
					throw; // No OnFailAction given? Let's poke the debugger xD

				onFail();
			}
		}

		internal class SnowBallException2 : SnowBallException
		{}

		internal class SnowBallException : Exception
		{}
	}
}