You have OrcChieftain in your card draw...Chieftain creates temporal +2...So its attack value is 8 at end of turn... if chieftain was alive, it would be 10.Bear got attacked once, so that gave it +1... but chieftain died, so -2... which is exactly the -1 you are probably talking about.
At first it probably will have 6 attack.Owner casted F5 near it, giving it +2 attack = 8 Attack.Opponent casted any spell, Most probably Inferno. Damaging Bear and killing F5 and E1.So final attack of bear will be +1 due to damage spell, -2 due to death of F5 = 7 AttackAnd finally, the lemure attacked bear in his attack phase, So Net attack = 8 Attack.Thats my theory after seeing the screenshot.
...If the chieftain was next to bear, then it would die later than Elven Healer, so his death would be announced in the chat. That's why this scenario is impossible.
Because you have no replay...
I think FORESTRY is probably right. The Elven Healer died right before the Scrambled Lemure attacked, which means that it was the opponent's Elven Healer (which means a big spell like Acidic Rain or Stone Rain had just been used; this idea is supported by the presence of multiple full-health Scrambled Lemures). The Orc Chieftain likely died right before the Elven Healer did, from that same spell.
How could Stone Rain be played, if there are some low-health Lemures (not Scrambled!) and a Water Elemental has 28 hp? And, of course, the fact that brams has the Stone Rain, but PhilTheLem was the one who did last turn.