User blog comment:Neowitch/709 - Defensive Attitude/@comment-1889545-20130516164314/@comment-4493594-20130517111100

Seeing how Bellamy was able to grab Bartolomeo I assume that his barrier only works against brute force but does not prevent people from touching him if no force is applied. (It might even be: the stronger the force, the stronger the barrier.)

And since it doesn't seem like Bartolomeo can cover himself with the barrier to strengthen his body like you could do with Busoshoku Haki, he'd be completely helpless against a Clutch attack. (He could avoid say Gigantesco Mano with his barrier, though.)

So, yes, if Robin sticks to sprouting hands from his body rather than anywhere else she'd squash him like a bug.