You must then freeze there on pain of death or worse until other dashing runners sneak up and give you "key" (mustinshould make physical contact) upon which you can move about the countryside again. The notion is that you put yourself at risk when you make a valiant attempt to save a compatriot runner. In reality these locks are keyed free with surprising regularity and the few chasers are left scrambling about in frustration.
Once the catchers (chasers) have forced all runners into a locked positions, the game is called and the sides switch, unless someone says "Bugger this da, let's go play cricket". Who become the gallant runners and who the vile and sorry chasers? How shall we decide? Put claps of course!