Help with TWRP on Nexus 6P

A strange problem. I flashed 18.1 and it seems to work (I can boot into a minimal system) but now I can't get into TWRP Recovery even though I used it to flash 18.1 in the first place. The phone powers up fine but when I hold down Vol- and power, it does not boot into TWRP but boots into Lineagos. If I try ADB, then it sees the phone but it's offline and I've tried all the tricks to get it back online.

I also notice that when the android on his back is displayed, then Download Mode at the...

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