How did he get involved?

他怎么卷进来了
As far as I can tell, this informant came to him.

据目前所知是线人主动找到的他
We'll know more once the informant signs an immunity deal,

如果您愿意签署豁免协议
provided you authorize it.

我们就能知道更多
How secure is the venue for the press conference?

新闻发布会的场地安全系数如何
Very. And I just raised the alert level.

非常高我刚提高了警戒级别
But we need to set up a call to inform Hassan about the threat,

但我们要在会议开始之前
ideally before the conference gets started.

及时电话告知哈桑
We can't tell Hassan.

我们不能告诉哈桑
Certainly not before the press conference.

至少要瞒到新闻发布会结束后
Why not?

为什么
Well, he might scuttle everything, out of concern for his own safety.

他可能会出于自身安全考虑弃协议而逃