The way i interpreted this was if you hit a 19 second freeze. And the 3 second immunity comes up. The 3 second immunity does not tick down until the 3 second immunity from a spear shove ticks down. So you "spear lock" someone for 4 spears, but cannot freeze them for 6 I believe.
Essentially if you saw that one yt video of someone getting speared in a pvp world. Thats what they removed the ability for.
Chain spearing is still viable, but there is usually an extra tick between 2 seperate spear'ers doing the spec. And they can usually run in between that.
This is a change that should've held in singles. Not multi. Makes no diff once you go to multi