Utterance-based reference chain

Round 1 (go to game round)

A: How about 2 people in green vest with one holding up stop sign?

Round 3 (go to game round)

A: How about holding up a stop sign?

Round 4 (go to game round)

A: Got it. I have the baseball mitt and stop sign.

Round 5 (go to game round)

A: I also have construction pic, plus the stop sign. Do you have stop sign?