From what was said in the past here, there were some experiments run (by pro's - scientists) that claimed that uncapped Colloidal Silver, ingesting it, that only about 75% of it makes it into the small intestine where its absorbed. The reason being that the action of the stomach on it causes the particles to agglomerate into larger "chunks" that can't be absorbed. Silver of and by itself is inert in the body.
With a protein capping agent, all of the Colloidal Silver makes it through the stomach and into the small intestine because the stomach does not digest protein and as such can't do anything to the silver particles.
Oh, and you can get LOTS of protein from things like beans (kidney, pinto, black,...) so its not like vegans go without. We'd die if we did. In this case however, for the half a pinch of animal gelatine, its not going to do anything bad.
The big issue with meat and other proteins for vegans isn't that its bad for us but more so that at about 6 months into a vegan lifestyle, our body loses the natural immunities to the bacteria in meat. IF you go back, you go through about 2 weeks of sheer gastrointenstinal hell until your body adapts again. I know someone who did. No thanks!
Me, I was diagnosed with a meat allergy back in the early 80's, cut it out, felt great after and never went back and strangely never missed it either. I still eat diary and fish once or twice a week so I'm not a strict vegan but believe it or not, how I eat IS classified as a type of vegan. I'm just doing it because I can't tolerate meat. Not much milk or dairy either as I'm somewhat lactose intolerant. Go figure. As they say, all you can do is play the game with the cards you're dealt. Such is life.
With gelatine, there is no bacteria that can cause issues and given the tiny amount needed, if even there were, our digestive system wouldn't even notice.