Last evening, the party waits at the Forest border for a group of elves. The PCs wrongly think that the elves will talk... One of the PC, invisible move around the first big trees to spot the arrival of the elves. The elves leader are a ranger and a druid, and the druid's animal compagnion (wolverine) detect the invisible PC with his scent ability.
The invisible PC then run to the party and say, "Elves coming!".
So the charismatic PCs move toward the forest..(thinking about what they will say) and that's where everythings get really bad... The elves doesn't want to talk and want to show them clearly that they are not welcome in the forest. The druid cast Entangle, a little first level spell that clearly doomed the party.
3 PCs are entangled in the middle of the 40ft burst. They all fail their saving throws... Now they have 10 elven ranger shooting them with their longbows from behind their trees..
The player's were a bit surprised of the power of that spell...
Is it something wrong with this situation?