Can people be nodes?

I’ve been studying a lot of MTAS because it’s like the polar opposite of DnD - thus meaning that learning it works perfectly for balancing my tabletop knowledge.

Now, I was looking at the Node background and I noticed that things like cars might count (meaning mobile nodes are possibly a thing).

So can a living being be a node? I imagine it would be really dangerous because mages would try to capture them all the time, but that kind of balances out the strength of having on-demand Quintessence.

If nodes are “geysers” of Quintessence formed from the ocean-like currents of belief, what’s stopping that geyser from being a Life Pattern?

Any thoughts?