If it's not announced, it probably doesn't last long enough to do anything different, given the number of announcements that I hear that clear 3 or 4 minutes later.
It looks like these were all announced looking at
https://x.com/search?q=line 2 from:ttcnotices&src=typed_query&f=live
The Victoria Park to Broadview was announced at 1:39 pm and cleared at 4:04 pm (ouch). I don't see the trespasser at track level listed, but there was 12:59 pmunruly customer at Spadina that cleared 1-minute later at 1:00 pm. And presumably the "power failure" was for the fire at St. George station that closed Broadview to Keele from 12:09 pm to 12:41 pm.
Now there was a trespasser on the track around Wellesley, at about 5:30 pm this afternoon - but that cleared in less than a minute.
Perhaps if Northern Lights tells us the station and bus number, we could check the data to see what went wrong.