si'erboi lujvo

s1=b1 is a snowball.

In notes:

si'erda'a
x1 engages in a snowball fight with x2 over issue x3, using snow/snowballs x4.
si'ernunda'a
x1 is a snowball fight in which x2 fights x3 over issue x4, using snow/snowballs x5.