Absolutely beautiful spot to open shorts IMO. Ultra-tight SL, or you can even play it against the ATHs. But if PA takes us indeed into the high 2800s, then I think it's better to just wait for another short in the ATH area. Or better yet, just wait it out.
Last call for bears to strike now, otherwise S&P may actually continue to new ATHs in 2019. Then again, as you said the markets have a perverse way to fuck up the largest number of people at any given time.

Reverse down now or boring chop for months to come, that is my call!