Katy, it wasn't that big a deal, it was just out looking for munchies and exploring whatever it came across, which happened to be the screen door with scents from house wafting through that interested it. It wasn't looking for me, just a way in. Once I slammed the glass sliding door shut it lost interest, did a 180 and took off.
They're an adrenalin punch at first sight, that was the biggest one I've ever seen, around 7ft., but their instinct is to flee, not attack, unless you're standing on it or provoke it. A rule of thumb is that if you can see it you're reasonably safe, it's accidental contact that is the worry, hence keeping them out of the shed where the tools and things are kept.
It's still around, I've watched Belle sniffing out a zigzag scent across the gravel now and then but so far they both haven't been out at the same time. I don't think she'd take it on, I've tried to train her to leave reptiles alone and just yap at them until I come, but it's a bit of a worry.
Don't remember if I mentioned when I first moved here Belle was going berko at a pile of empty plant pots and paving blocks. So I threw her into the house to stop her killing yet another Blue Tongue, moved a block carefully and had a foot or two of shiny brown tail flip up in front of my face. The front end of the snake was heading for the gap under the wire mesh fence but I wasn't there long enough to see all of it go through.
A Queensland member used to post pictures of the ones that sunned themselves on his back verandah, they didn't bother him because he didn't bother them. When he opened the door they fled, no problem.
If I find one in the house then you can bet I'll be calling Wires or 000 about it but when it's gone, it's gone, no point in moving out because it had been there.