We seem to have some very similar experiences
A long while back some guys were watching me work with a friend of mine another taiji teacher.
They came over and asked what we were doing,
we had seen these guys practicing what they said was sambo.
Most of the time for people who stop by and ask questions, I'll just say its yoga or whatever not wanting to draw attention to what we are doing.
My friend suddenly said, “ this is taiji push hands want to try it with him” meaning me .
I looked at my friend thinking “dumbass ” the sambo guy which is what they called it,
tried something and I easily threw him out. Just being friendly.
The 2nd time he tried to take out my knee, which he did catch,
I still threw him out but this time I was injured but could not show it, not wanting them to know anything about it.
The 3d time I threw him out in such a way that it let him know what could be if he wanted more .
My friend stepped in and said we had to go….
They thought it was very cool, and thanked us as they left.
It was good experience, but I was worried that i had torn something in my knee.
The next day very hard to walk lucky for me it cleared up over time.