Apply Distribution is an interesting behaviour. Currently, in Cavalry 2.5.3 it is an experimental feature and only available to Pro users. Hopefully this will change soon and everyone will be able to use it.

This behaviour acts as “mini Duplicator”. You can use it directly on meshes to distribute sub-meshes in the same way as Duplicator would. It is great, when used with Text layers. As demonstrated in the tutorial, you can easily distribute individual characters, whilst maintaining perfect text edibility.

When you combine it with Blend Sub-Mesh modifier, you can easily transition from one distribution to another, without using Duplicator itself.