Not my area of expertise, but in my copy of Handling the Big Jets by Davies (3rd edition), he mentions fuel dippers as a means of preventing damage from excessively high turbine temperatures. If I understand it correctly, the fuel dipper sensed a significant rise in turbine temp and cut the fuel for a short period in an attempt to prevent overtemp. Davies mentions it as a way of handling intake upsets associated with stalls, or military requirements such as gun firing.
Hope this helps