During this step, we're going to set your jump loop to jump end transition.
Return to the Arms State Machine graph and drag a wire from the JumpLoop state to the JumpEnd state.
Double-click the transition to edit it.
Control-click on IsFalling in the My Blueprint tab and drag into the graph to create a Get Is Falling node.
Drag off the output Boolean pin on the Get Is Falling node and create a Not Boolean node.
Connect the output pin from the Not Boolean node to the input pin of the Can Enter Transition pin on the Result node.