看到一篇英语小短文 里面有一些疑惑

看到一篇英语小短文 里面有一些疑惑
At the beginning of the World Series of 1947, I experienced a completely new emotion, when the National Anthem was played.This time, I thought, it is being played for me, as much as for anyone else. This is organized major league baseball, and I am standing here with all the others; and everything that takes place includes me. 为什么前面描述的是过去的 到最后 为什么会变成 I am 现在进行时了？