No Loud Hailer Needed
Although Christian's hail to "REMOVE YOUR BOW" wasn't needed, we estimate our sprit dodged the offending transom by 12"...perhaps less. Loud communications within our cockpit were unanimous and accompanied with loud urgency to
'Come Down Hard! Now!'.
The image doesn't capture the essence the GoPro video/audio does, but the sequence played out thus: we on starboard, a sister-ship O-34 crossed on port, tacked (too soon?), squatted in our immediate path, headsail flogging as we overtook...with our bow rotating to port, sprit barely missing the transom (my quote to crew as each checked for stains: 'No problem, had it under control') and the GoPro captured the "sorry about that" from the O-34.
Beer Can in Chicago on Lake Michigan: No contact = no blood = no foul.