So, no downgrade in guidance simply an indication that it will...

So, no downgrade in guidance simply an indication that it will be at the bottom end of previously issued guidance, but NO downgrade.
Prior to the announcement the company stood at a cheap PE of 9.5 with NPAT expected to RISE.
Revised guidance confirms NPAT rise of 20% compared to last year.
On this guidance the share price is smashed almost 15% in two days?
Not sure what I am missing but when a company with good growth prospects at a PE of 9.5 confirms an NPAT guidance of almost 20% what on earth would it be smashed like this. Please, nobody tell me that the markets are rational!