Who is clenching the fist in these Hadiths?

I was reading these hadith and i was confused about if it was referring to Allah or Prophet Muhammad ( Pbuh)? "Abdullah b. Miqsam reported that he saw Abdullah b. Umar as he narrated Allah's Messenger (may peace be upon him) as saying: Allah, the Exalted and Glorious, would take in His hand His Heavens and His Earth, and would say: I am Allah. And He would clench His fingers and then would open them (and say): I am your Lord. I saw the pulpit in commotion from underneath because of something (vib-ating) there. And (I felt this commotion so much) that I said (to myself): It may not fall with Allah's Messenger (peace be upon him) upon it" https://sunnah.com/muslim:2788b Here it implys that Allah is the one that is clenching his fist but here “I heard the Messenger of Allah (ﷺ) say on the pulpit: ‘The Compeller (Al-Jabbar) will seize His heavens and His earths in His Hand’ – and he clenched his hand and started to open and close it – ‘Then He will say: “I am the Compeller, I am the King. Where are the tyrants? Where are the arrogant?” And the Messenger of Allah (ﷺ) was leaning to his right and his left, until I could see the pulpit shaking at the bottom, and I thought that it would fall along with the Messenger of Allah https://sunnah.com/ibnmajah:4275 Here it is the messenger of Allah that is clenching his fist. So I was wondering if which one it is?