How this is a blunder please help

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Illusion723

can anyone please tell me how F5 is a blunder in this position

llama47

In the image you post the engine tells you what happens next. 11.exf6+ Ne6 12.Bb5+ 

FlipperThePriest

Thw

FlipperThePriest

The white pawn e5 takes en passant and puts black King in check via a discovered attack with the Queen.

Illusion723

Thank you for the help