As Lyren said the flying glitch you "found" is unfortunately useless and not a rare occurrence in source engine games/mods with dodgy prop hitboxes. Still though, it's nice seeing people mess around with hl2 mods in any form! :)

This was already known and is useless in runs but good job on finding it!

If you're on steam: "save :; reload" and if you are on ghosting bind [key] "save ThisisnotspeedrunitslikeusecheatingyouareuseholesintexturesetcyoucrosshalfgameovertheairthisisnothonestlyIthinkIMHOthisisnotrightlytogolikeitItisimmitatingofcompleteofthegameSureyoumakeglobalandcosmicalworkYouareexxellentspec; reload"

Yes, this is normal. Just type r_portalsopenall 1 to fix.