Nah.
The lions would have died against the T-rex especially in retreating. The raptors are much faster than the lions and wouldn't have been able to escape most likely....if anything, it shows that the Raptors would not be the ones shitting themselves and running like little girls when confronted with danger. The lions running away against the T-Rex would count as withdrawal from the battlefield.
And now for a word or two from a much braver lion than either in this debate....