It's no small thing to make those scorch marks and make them smoke on set... so the effort is clear to make the point.
Both bolts were bounced away back into the walls.
I just wish Vader was cool enough to snatch the gun and have it land in his hand with proper grip, aimed at Solo's head.
Interesting to see in HD. Han fires at least four red laser bolts at Vader. There are two glowing scorch marks seen to appear on the wall (and one on Vader's glove.)
As I said, if the filmmakers' intention was that Vader is deflecting/bouncing Han's laser blasts back in a targeted way with his hands (at Han/group or otherwise), then firstly, wouldn't we actually see RED LASER LINES coming back off his gloves and hitting the walls (and preferably to make it clear, in four places around the heroes)? Isn't that the only thing that would visually confirm this "targeted bounce back" idea?
But we don't see that - what we see is a massive shower of dozens of WHITE jagged long sparks, a couple of which go a bit further out than the rest. There is also a scorch mark that hits on the wall NOWHERE NEAR Han and the group.
If we saw even one red laser line come back off Vader's gloves, I'd agree he's bouncing - but no bounced red laser line, no idea of Vader bouncing laser bolts in a targeted way.
Therefore, the intention is clearly that it is just that he absorbs/stops the blasts, but creates massive spark explosions that scorch the walls in a couple of random places, not that he is "bouncing" them, and certainly not in a targeted way. Bouncing lasers in the OT requires a lightsaber, and even then its not used in a targeted way.
The idea of
targeted bouncing of lasers doesn't exist in the OT, even with a lightsaber - it's the domain of video games, ST and RO. When Luke bounces a laser bolt into Klaatu in ROTJ and kills him, it's supposed to be just a freak luck thing during a deluge of laser blasts, because Luke never intentionally bounces back lasers in a targeted way in the whole rest of the movie.
And even when he should - like when the Speeder bike is coming at him firing lasers, or when lots of blasts are coming at him on the skiff. Even in those cases, the bolts just randomly bounced away.