It is hard to think of a PMQs like it – it was a painful watch.

The prime minister battled on, his tone assured, even if his actual words were not always convincing.

But it was the chancellor next to him that attracted the most attention.

Rachel Reeves looked visibly upset.

It is hard to know for sure right now what was going on behind the scenes, the reasons – predictable or otherwise – why she appeared to be emotional, but it was noticeable and it was difficult to watch.

Reeves looks visibly upset as Starmer defends welfare U-turn – politics latest

Her spokesperson says it was a personal matter that they will not be getting into.

Even Kemi Badenoch, not usually the most nimble PMQs performer, singled her out. “She looks absolutely miserable,” she said.

Anyone wondering if Kemi Badenoch can kick a dog when it’s down has their answer today.

The Tory leader asked the PM if he could guarantee his chancellor’s future: he could not. “She has delivered, and we are grateful for it,” Sir Keir said, almost sounding like he was speaking in the past tense.

It is important to say: Rachel Reeves’s face during one PMQs session is not enough to tell us everything, or even anything, we need to know.

But given the government has just faced its most bruising week yet, it was hard not to speculate. The prime minister’s spokesperson has said since PMQs that the chancellor has not offered her resignation and is not going anywhere.

But Rachel Reeves has surely seen an omen of the impossible decisions ahead.

How will she plug the estimated £5.5bn hole left by the welfare climbdown in the nation’s finances? Will she need to tweak her iron clad fiscal rules? Will she come back for more tax rises? What message does all of this send to the markets?

If a picture tells us a thousand words, Rachel Reeves’s face will surely be blazoned on the front pages tomorrow as a warning that no U-turn goes unpunished.