Not sure if this would make sense with the new 8th edition rules.
 
Under 7th, which this was written during, Warhounds had 2 void shields. Any glancing hit would bring a shield down.
 
The maths.  
Multi laser is strength 6. Then you add a D6 and try to match,(glance) or beat,(penetrate) 12. So a 6 will bring a shield down.
 
At least my own story stays within the limits of what can be achieved using the rules. I’ve read one where a marine penetrates the armour on a Necron Monolith with a power sword.
 
Same maths.  
Strength 4 vs armour 14.
 
…..
 
So he’s just rolled a 6 sided dice and scored 11 on it has he?

@kleptomage  
Yep, they were brought down by the Guard’s multilasers a couple of pages earlier.  
>>1481890
 
In game, any glancing or penetrating hit takes a shield down. That means a multilaser needs a 6 to glance after hitting. Lucky, but do able.
 
The only guy with a Las cannon then got a lucky hit on the mount for the Plasma Blastgun, hence it being smoking here.

Don’t warhound titans have void shields?