I believe antichrist is the second beast.
There are the three characters of Christ—prophet, priest, and king. When Satan is cast down from heaven, his anti-priestly character is gone, he can't accuse any more.
The second beast has two horns, and is an anti-king. The anti-prophet character, the prophet, is seen in the other beast, and this anti-prophet character abides, when the two others are given up.
Ques. Do you find the first half-week in the Revelation?
What goes on then, you do; until you come to the little book, you get a certain time elapsing, which is before the half-week.
Ques. What is “that good thing" Paul committed to Timothy?
The truth of the gospel, I suppose.