The guy is shaking as he senses the cold weapon on my hand is not budging and shaking. Just by having enough strength to pin him like this is enough to cause him to fear what is coming for him.
"Hey...let's talk it out will ya? Please let me go, it is getting harder to breath like this..."
However, instead of lowering my guard, I put the blade more on his throat more than ever, enough to graze his throat and get a small cut which causes for it to bleed a little bit.
"I am not a patient person. If you keep on dilly-dallying a lot longer, I will not hesitate to sink the blade on you. I assure you it will be painful for you. Now speak while I still hold my patience."