Realising that any form of cascade created at its inception a Travis Field of 3.2 +/- 0.6 Onds, he calculated that this field could be polarized and cancelled by a transverse shunt of at least 1.8 strats. Furthermore he realised that any ghost station within a lateral radius of 8.4 glimes of the initiating cascade station would supply such a sufficient shunt potential provided it was played within two (or in certain circumstances three) moves of the cascader. This meant that any form of cascade could be halted (and indeed terminated) very rapidly.
The reason the bung is not more widely used, as Framilode himself pointed out, is that the commonest form of cascade - the Parks and Greens Cascade - is not normally injurious in any way thus making the bung somewhat pointless. However other station cascades such as the Regal (or Royal) cascade (i.e. Kings Cross, Park Royal etc.) can be a little more difficult to maintain and in these cases the bung can be much more useful.