Can I report this to a gm?

[snergle]

I duo in bm a lot with a necro. Some asshole has been spawning absurd amounts of trap mobs including some that are see invis then clogging the water tunnel with them. Oh well I have to calm anyone I group with through bottom. Now the person has blocked off all 3 entrances to spiders with 5ish shards and 1 large shard making it effectively impossible for a non enchanter to stroll into bm. I don't know who is doing it but I assume gms can check the logs of those mobs.