Kingsley Shacklebolt did not act immediately. Instead, he said to Snape, "Professor Snape, this is a necessary part of Auror procedure. I hope you understand."
Snape narrowed his eyes slightly, his gaze falling on Old Barty Crouch's stern face. A note of mockery entered his voice. "Of course I understand! In fact... I witnessed it many years ago."
Kingsley Shacklebolt held his own wand in one hand and Snape's wand in the other, pressing their tips together. "Flashback Charm!"
A faint magical disturbance and a weak Magical Light appeared at the tip of Snape's wand.
"That was a Leg-Locker Curse." Having identified the spell, Kingsley Shacklebolt continued casting the Flashback Charm on Snape's wand. "Flashback Charm!"
Throughout the process, Old Barty Crouch kept hold of his wand. Rather than looking at Barty Crouch Jr., he continued scrutinizing Snape.
Having completed the magical examination, the two Aurors rose and approached Old Barty Crouch.
One of the Aurors reported, "Director, we found the lingering effects of the following spells on the suspect..."
The other Auror handed over a parchment scroll. "We've recorded the names of those spells on it."
"Thank you for your work." Old Barty Crouch nodded before accepting the parchment scroll.
The two Aurors naturally raised their wands, taking Old Barty Crouch's place in keeping watch on Snape.
Snape was not surprised in the least. A clear sneer appeared on his face as he casually leaned back and folded his arms, waiting for the coming interrogation.
He knew perfectly well that, even now, Voldemort's "Heavenly Eye" was still monitoring him.
Thus, what he needed to do most at this moment was display his abilities under the Heavenly Eye's surveillance. Only then could he maintain his true identity.
Now that he had confirmed Vizet still existed, he had adjusted his mindset.