having what we call their anniversary reactions earlier than usual. for some people, it's because this anniversary happens to be coming in the context of a pandemic. >> reporter: so it's a confluence of events. >> yeah, absolutely. some patients started isolating more during the pandemic and having a really hard time actually mobilizing themselves. >> reporter: this 20th anniversary, coming on the heels of the pandemic, is even triggering first-time mental health issues. >> we had eight new patients coming in, and all of them needed psychiatric treatments. >> reporter: for you the memories are so vivid, but do you think for some others that the memories are fading too quickly and that they don't really appreciate-- >> i think so. i think it should be talked about, you know, what they did. they gave their life, not me. >> reporter: and honoring that sacrifice could be another path