Does trip disrupt spellcasting?

[Malin Genie]

A melee attack which deals damage will force a concentration check if it interrupts spellcasting.

What about a melee attack that deals no damage? Grapple has its own set of rules (no S components, DC 20+level concentration check) but what does a successful trip or bull-rush during spellcasting do (if anything)?

 

[Viktyr Gehrig]

I'd say it does the same thing.

To be nicer, I'd allow the S components, but raise the difficulty of the Concentration check.

 

[Oni]

A melee attack which deals damage will force a concentration check if it interrupts spellcasting.

What about a melee attack that deals no damage? Grapple has its own set of rules (no S components, DC 20+level concentration check) but what does a successful trip or bull-rush during spellcasting do (if anything)?

I would say that falls under violent motion, forcing a concentration check of 15+spell level.