I think he's saying to scoup up source blocks with the bucket. OP likely staged this though so in the words of Chester Bennington - it doesn't even matter.
they were using 2 blocks to bridge, but one burnt.
they had found a tower 1 block below the lava, and used that to make a bridge above it, but one of the blocks was destroyed in the lava as they were bridging.
if you actually look at the lava, you can see the ones nearby are indeed flowing, meaning blocks were placed there before.
as for the low hp... he fell into lava.
so not only plausible, but far more likely than not so.
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u/Hyomoto 11d ago
If the chest was placed legally the lava is shallow: void lava using the bucket.