On another occasion, I was equally late to a connection flight (this time, not my fault), and I got through security despite having a bottle of water, a toiletry kit (including 5" blades), etc.
Why? Well, I don't know and I don't really care. The fact of the matter is that they will give me an aluminum can on the flight anyway, so who cares how long of a blade I bring onboard in the first place? It's security theater no matter how you slice it.