I don't know if the fact that his weapons changed is a "problem", it's just a little lacking of continuity. When you make your characters I give you a lot of freedom to make them as you want them and give them whatever items you want them to have, but once the character is made... well, new items don't just materialize out of thin air. His new weapons would have to have come from somewhere, and quite frankly Salas himself would need a reason to switch his previous set of equipment for this one. (Not that thinking of somewhere he could have acquired new weapons from would be particularly hard, considering the battlefield littered with nearly two thousand crusader corpses that occupies what was once Gariel Downs.)
Poisoned, passed out and nursed back to health... how long do you imagine this would have taken? It sounds like a rather long process to me, and with the characters Salas shared the scene with (Jillian and Gerald) only around half a dozen hours or so has passed. Besides, it would leave some rather gaping plot-holes and inconsistencies to use that explanation, such as how he survived the confrontation with the Wyrmslayer (he could just have let him go, mind you, since the Wyrmslayer did not really want to fight him in the first place), how Salas was poisoned (wyvern venom kills quite quickly, as does the rangers' poisoned swords, and druids are capable of neutralizing these poisons in a matter of seconds) and how and why a druid survived and felt obliged to help Salas (the Anaxim Forest has been burnt to the ground, and all of its inhabitants have been killed; the likelihood of a lone druid surviving (and of this druid having stayed away from the battle, its occupation considered) is slight at best).
If you can't think of a way that Salas could have escaped the destruction of the forest I may be able to help; it would even provide a plausible way for him to be reunited with Jillian and Gerald, if that is what you want.