The cells F3 and F4 <-> B3 and H4 form a W-Wing pattern on the values 5 and 9.
In col F there are only two cells (F3 and F4) which may be 9, so one of those two cells must contain the value 9, and those two cells also have two siblings (B3 and H4) which can only be 5 or 9, therefore one of those two siblings must contain the value 5, therefore any cells that are siblings of both the siblings B3 and H4 may not be 5.
Other occurrences of the value 5 can therefore be removed from siblings of both B3 and H4, ie H3.