The blood knight needs to get off his high horse.
For starters, Vicissitude does not require something as base as stitches, but that's a side-trail. Now how's about y'all tell ever'body here which source books/ supplements say the Tzimisce "often" mask 'n spy. Sounds like you're claiming it's a major function of the clan.
Sorry cowboy, "actually" that's Nossie Country. It's gonna stay that way until you share some dee-rect quotes followed by "WW#### (Title) Pg.#" Last time I checked, y'all better have a
bunch of 'em all sayin' the same thing if you're trying to lay a hands-down Straight Flush.
Don't you worry none, Parder. A real-deal cite is a mighty easy thing to check. There's a nice long row of green spines on my bookshelf followed by a big 'ole block of black-purple.
Otherwise I'm callin' yer bluff, Mistuh Knight.