Question about grammar and swords?

First question, no it's not commonly found in European sources how to sheath a sword. I say commonly because I don't know all the styles that was born in Europe, just as you can't really speak for all the kenjutsu schools in Japan. Also unsheathing attacks are not commonly found in European swordsmanship neither. This is not to say none of the European styles had it because there are few German and Italian sources that covers unsheathing, though usually in a form of a bashing with the hilt or some controlling technique with the sheath. Like wise I'm sure there are few European sources that contains formulated techniques for sheathing a blade.(Though to be honest there is no advantage to be found in training to sheath a sword. All part of combat should be done by then.)

Second question, generally the side ridges comes down and disappears to the naked eye by the last few inches of the blade. So the tip shape is more a like a thin ellipse cone with two sharp edges.(I hope that makes sense) You can just google broad sword or something and you'll be able to see for yourself. I have heard that there are rapiers and small swords that had four angles coming straight down, and it was because these swords were just meant to stab not cut so they bulked up the sides more to make the blade more sturdy. I might have seen few like it, but nothing that comes to my mind right now.

PS as stated before, there were thousands of different schools of fencing/swordsmanship in Europe. I'm generalizing with the above information and I'm quite sure you can find at least one exception for those rules without even trying that hard.