Fully Fledged
Would risk it all for the Colonel
There's also the shock value of the attack. It seems like ages when watching it, but in real time even they would have been in a panicky state.
Maybe he is poisoned but it's a slow acting one that will take effect later. Maybe he is immune to that particular poison. Not worth getting worked up about.
I just think his character is very 'Gary Stu' the poison was the least of my complaints about him. It's just the one that people have picked up on.