As of old, he found himself at a loss with her.

And now he found himself at a loss for words.

Now he found himself continually at a loss for words.

I found myself at a loss to know what to do about it.

And with this, I find myself at a loss for further precautions.

He scanned his memory and found himself at a loss.

Grey found himself at a loss, both for words and action.

Jim found himself unexpectedly at a loss as to just how to answer that.

He found himself at a loss for other words.

The prospect of release had apparently found them at a loss.