I would completely agree on most accounts. But, in recognizing the issue as his, he questions the accuracy of his perceptions of her behavior. He MIGHT not be wrong about what he saw and experienced when he tried to connect with her. She MAY have been not just really caught up, but TOO caught up.
My wife is the ultimate hostess. She may get very into her partners, and very en-rapt in what she is feeling. She may be experiencing something I can't give her (see afore-mentioned 10 inch penis). But I'm always part of the equation, and she can, and will, always pull back from it for me.
What I'm getting at is, he may be very emotionally close to the situation. But, she pushed his hand away when he needed to connect with her. She didn't want him to be part of the equation, even as her "anchor" because she was so wrapped up in her partner.
Let's give the benefit of the doubt and suggest that, perhaps the original poster's emotional state caused him to misinterpret what happened. Let's say she didn't REALLY push him away, he just thought she did. He should still be able to talk with her about it. She should be willing and able to put his mind at ease, at least for the moment. But, if it happens again...NOT her extreme pleasure, BUT her pushing her husband away, he would not be wrong in asking her to NOT be with him anymore. Because the connection is threatening.
I realize when someone seems TOO close to a situation, it's easy to dismiss, or diminish their perception of an experience. I've seen it with my own eyes what happens when two people connect and lock onto each other like that. I was emotionally close to the situation. I also wasn't wrong about what I saw or the harm it can do. You don't have to be swingers for it to happen, and it seriously risks crossing a line.