During this step, we're going to set your jump end to idle transition.
Return to the Arms State Machine graph and drag a wire from the JumpEnd state to the Idle state.
Double-click the transition to edit it.
Right-click in the graph, search for and select the TimeRemaining for 'FPP_JumpEnd' node.
Drag off the Time Remaining output pin and add a <= (float) node using the Context Menu.
Enter 0.1 in the other output field on the <= (float) node and then wire the Boolean outputpin from that node to the Can Enter Transition input pin of the Result node.