I never learned in the Mir, so I was not a student of his. However, years ago on one of his fundraising trips, I did have the zchus to meet him briefly. He came to speak at my yeshiva. We were told beforehand that he wasn’t feeling well. When he spoke, is voice was so weak we could barely hear him.
Afterward, I had my chance to meet him. My Rebbe took me over to him and told him my name. When he spoke, it was even less than a whisper, and I could barely hear him. He gave me a brachah while holding my hand, and that was it.
What struck me was that although he wasn’t really able to communicate by speech, he still communicated. You could feel the warmth and love just rolling off of him. You really felt, here was someone who cared about you despite just meeting you seconds ago.