A fine pass play

Colts showing man-1, Rams have bunch right. But the #1 receiver (Austin) does a ghost reverse and it seeming screws up the colts man defense. The guy who likely had Austin is late picking up Kupp, waaaayyyyy late. The TE (#3) blocks back into the middle, so he perhaps confused his guy, in any event no one picks up the #2 receiver (Kupp) and as the line receeiver on the top side clears out the top of field, it's about as wide open as it gets.

My opinion is the guy who was responsible for Kupp is the guy I have circled on the 2nd still and then he hangs out around the 40 in the next two stills, doing nothing. I think the guy who had Austin ended up chasing Kupp...