This is two rather dissimilar calls, depending on the type of triangle.
From a tandem-based triangle, the lead base does a sort of 1/2 Run, to become the
apex of a new triangle. The apex and trailing point extend to each other to
become a new wave base. Think of the call as sort of a "1/2 Circulate".
\petriangle{b1s,g2n,g1n}
\pntriangle{g1e,b1s,g2n}
before Convert the Triangle
after
From a wave or couple-based triangle, this can be quite tricky. The apex
steps ahead, usually (but not always) to become the lead base of a
tandem-based triangle. Any wave or couple-based person who is "infacing"
(facing toward the apex) steps forward behind the original apex and
turns to be tandem behind her. Any "outfacing" base person does 1/2 of a Run,
usually to become the new apex.
\pntriangle{g1e,b1s,b2n}
\pstriangle{b1w,b2e,g1e}
before Convert the Triangle
after
Infacing base people always step behind the original apex, even if the triangle
is facing:
\pntriangle{g1w,b1s,b2n}
\pstriangle{b1w,g1w,b2w}
before Convert the Triangle
after
If both base people are infacing, they both step behind the apex, maintaining
their order. In this case the result is a column of 3.