Ak!
No, I don't think a bird of prey will bounce off
a net. They come down with talons out to grab
their prey. More than likely you've never had one
visit. They are pretty smart birds.

I found this bit of info ~
Care must be taken when selecting and designing both temporary and permanent exclusion systems. Failure to do so can result in systems that are ineffective, cumbersome to work around, and a hazard to either the birds or the fish enclosed.
Selection of proper materials is of critical importance. Use small (1-
to 2-inch mesh) wire or net to exclude all birds, but avoid finely
textured netting that may entangle birds on contact.

Personally I would never net my ponds. Too dangerous for the dogs and
neighborhood cats and any bird, mouse or snake who stops by. My pond
is structured so that is not that easy for the neighborhood heron or
visiting kingfishers.
Also we don't have the big water snakes like in some parts of the
country and only one raccoon visit and they got treed much to their
dismay.

k :-)