Editing Sequential Patching

You discribe:

Sequential Patching –
For quick sequential patching (also known as ‘block’, ‘one-to-one’ or ‘diagonal patching’)
• Touch and hold the first available patching block you wish to patch to until the touchscreen rotary illuminates.
• Turn the touchscreen rotary increase or decrease the number of channels you wish to patch; these are displayed as blue patching blocks.

But if i want to edit the diagonal row, i can only increase and not decrease!

They just mean if you start, and go too far, you can back off. You can’t use this technique to delete a bunch that already exist.

Yes, thats exactly what I meant.
And I see no reason why that is.
In my eyes it looks more like a bug.