Lyric discussion by takemycarnow 

Cover art for The End lyrics by Saves the Day

In the old lyrics, the speaker went on to insult the person they're referring to.

"Got a grenade in your teeth, and you're pullin' at the pin. You're an imbecile..."

I think Chris might be saying, in this song, that he realized just in time that he was acting in an uncharacteristic way. The song is definitely about regrets.