Thank you, Roland. I am relieved.
Looking at your picture, I get the feeling that these arrowheads would have remained in the enemy's body after the arrow had struck, and that "medical assistance" afterwards would have included digging the arrowhead out.
With the attachment of the shaft to the arrowhead as flimsy as it looks, if the arrow is extracted, the head would stay behind, I think.
I suppose some collector or student of ancient history would have reconstructed such a Greek-Roman arrow by now, to show the complete item? The shaft would have to be sharpened for insertion into the little hole in the arrowhead. Maybe they used some natural glue or resin.