If it's addressed to me, i really didn't wanted to hurt Your feelings. As You wrote, You held down the blade (if i get this right- to a table, or something). So, if the situation is this-You can easily chip a blade, while holding it against to something, because if You apply some pressure to the blade, a power tool can easily crack it (because of the stress building up in the blade). A couple of days ago i was making a TNT (Thumb Nail Test) with a Wapi, and i realised, that the very edge of the blade was bending only from the force, that i layed it down on my nail. (So, a very little stress is enough to broke a blade). That is the reason i wrote - how to hold a blade (in Your bare hand) - It's not recommended if you use power tools.
For me, i like better to hold the blade in my hand while sanding. (You can't apply too much pressure while sanding - Honestly: You can, but it's much harder...).
So, anyway, if i said something wrong: I'm sorry.