after the tribulation ends, does 'Christ appear
The text describes the sign of the parousia (What will be the sign of your presence) before and after the tribulation begins. If you compare the Parousia to the fulfillment of all the signs Jesus gave the 1 century christians before the destruction of Jerusalem and the Seige of Jerusalem as the great tribulation, the sign of the parousia has many aspects such as war preaching etc—and Christians see that sign others take no note of the sign of his Parousia. When the enemies see the sign, they are caught likevthe Romans caught the Judeans,
So when it hits someone over the head, they don’t need a sign.
Convergence of many scriptures having to do with irony, poetic justice, timing, vengeance. In other words: “ I’ll show you.”