Real lizard legs are splayed to the side, as per the earliest reconstructions of sauropods like diplodocus.
Consensus seems to be (now) that the big quadrupeds had limbs under their bodies and tail out back. I guess a long tail would be useful to counterbalance a long neck (which Bob does not have), a massive head or a heavy eggshell.
But...
The nearest equivalent to a raptor or therapod I've at got home is my deadly silky bantam chickens.
When they charge towards me in a ravenous omnivorous frenzy, their legs their feet strike the ground beneath them. However, because of the width of their murderous talons they bring their powerful legs out to the side as they swing them them around to take the next inexorable stride towards their hapless prey.
Thank goodness they have relatively light beaks. If they had murderous jaws full of serrated teeth, the bread crusts which are their natural prey would be torn to quivering shreds. Or they would fall flat on their faces.
I think the tails on our lizardmen balance them while walking and running (saurus in particular have hips to the sides rather than under them.
Close combat fighting requires them to rear up and back (with tails down), otherwise their heads would be vulnerable and they would sacrifice the reach of their weapons.
The tail could still work as a third point of balance or a counterweight.
If there is an opening for them to chomp on some chaos aligned neck, jaws will thrust forward and tail will thrust back, with no breaking of conservation of momentum.
That's predatory fighter right there, pal! (curse you second rank

)
Wife of Bob looked over and said, "you're writing a lot." and asked what about. (I'm wearing her down slowly)
When I explained the very serious question from Scalenex about tail biomechanics, She said she has got a better reply.
"Ask them if they have ever seen a kangaroo."
I just smiled patronizingly. Of course you have!
And the ChaOz Chimaeroo's tail has an obvious function.
http://www.lustria-online.com/threads/spawning-of-bob-and-friends.10886/
Last time I heard, the forces of Chaos were saying, "You can keep your tail mace, Centurion. And screw you biomechanics!"