The seven cells B8, E8, F8, G8, H8, I8 and B5 form a TUVWXYZ-Wing.
The six cells B8, E8, F8, G8, H8 and I8 are an Almost Locked Set (ALS) that is linked to the bivalue cell B5 through the value 3, so if the value 1 was eliminated from all seven Wing cells then the remaining value 1 of B5 leaves just five values to fill the six ALS cells, which is invalid; so 3 is "locked into" these seven Wing cells, hence 1 can be removed from cells which see all 1's in the Wing.
Therefore we can remove E5-1.