Yes, downloading a torrent chunk of a copyrighted work iswould likely, in most cases, constitute copyright infringement under Canadian law.
The idea of downloadingIt isn't possible to download a torrent chunk, or anything else, without saving it to disk doesn't make sense. When you download something, you are creating a local copy of it. Whether that's on a disk drive or in volatile memory (and in fact it's almost always on a drive) doesn't make a difference; it's still a copy. Even if the software immediately clears it from memory without saving it to a conventional disk drive, the copy has been made.
Nor doesis it likely to matter that you're only copying a part of the whole. The amount oflegal threshold for the work you copy canamount that must be a defensecopied to constitute infringement is low, especially in a chargecase like a torrent, where you aren't adapting elements of copyright infringementa work, but only assimply copying a "fair use" defensechunk of it wholesale. IfOf course, if you could makedownload multiple torrent chunks of the same torrent, even if you download them separately and don't combine them, the court will likely consider them together.
There may be defenses you can raise to a plausible case that your useclaim of BitTorrent wascopyright infringement, such as fair usedealing, but those are going to depend on the totality of the circumstances--for example, if you were you doing an academic study on the use of BitTorrent for copyrightable materials--this might make a difference. But in general, copying partor were you just trolling for Game of Thrones episodes. But that's a work is still infringing, even if you never "reconstruct" itmore complicated question than the purely mechanical question at play here.