I guess it depends on how I choose to run Hiding vs Perception (the 5e rules are vague as mud, and there's a lot of arguments to be found on how it's meant to work).
Tommi moved through what's technically Line-of-Sight (and everyone is assumed to be aware of everything in Line-of-Sight unless the DM decides otherwise) and then he moved into Cover, which gave him the ability to use the Hide Action (which he did, as a Bonus Action, IIRC, because he's a Rogue).
Now, the Orcs weren't aware that anyone was there until the Wolves started howling (which they did after your bonus 15' move - which wasn't enough for Tommi to get into Cover) so I'd assume not every one of them was looking when Tommi slid down the hill and dove into a bush, but probably a few of them were. (Some of them may have been looking at the Wolves, or at each other, wondering what the wolves were going on about).
Still! Tommi's hide has beaten all their Passive Perception scores by a mile, so if they want to find him (even if they know that he's "somewhere in those bushes") - they've got to take the Search Action or they don't know where he is. Sure, they could just thrust their sword or hack at the bushes with an axe hoping to get him, but I should (in the very least) roll randomly to see if they're even attacking in the correct Square (The brush he's in covers about 5 squares, so I should probably roll a 1d10 and have them get Tommi on a 9 or 10). Even THEN, they'd roll the attack with Disadvantage, because they still can't See him.
OR, they could just go after the people they can see that are trying to kill them. They'd be aware of the danger in the bushes (which story-wise would explain what happens if Tommi misses on his attack).
Those are my options. As for what I'd do? I'd usually have a boss order a flunky to search for him, which will probably fail, but only if they've got nothing better to do. They'll probably fling javelins up the hill at visible targets instead. We'll see.