metalsie

have exact problem as you Joe

You're probably running too much scripts in the fight, or running out of vram. Either way here are things that might help... http://skyrim.nexusmods.com/mods/38649/?tab=2&navtag=%2Fajax%2Fmodfiles%2F%3Fid%3D38649&pUp=1 Helps with vram usage. http://skyrim.nexusmods.com/mods/9080 Use these rather than official HD textures. Also disable enhanced blood and try that way. I was having constant crashes with it.

Download this mod and try playing http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1 Also use optimized HD textures rather than vanilla HD http://skyrim.nexusmods.com/mods/9080

Try this mod http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1

Luckyly for you, someone recently made a mod for this. http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1

Can you describe where and how the crash occurs? Also check the load order of your bigger mods. BOSS is not perfect.

Are you crashing or getting an infinite load screen? Either way use this mod http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1 also Riften Bigger Trees.esp ActiveSkyFalls - Distant Waterfall Overhaul.esp ActiveSkyrim bigger trees.esp ActiveIncompatible with: Riften Bigger Trees.esp and Markarth_plus.esp Activeyou already have ETAC installed this might be causing crashes. Download and install wryebash and make a bashed patch, should merge some of your mods.

use EnBOOST http://skyrim.nexusmods.com/mods/38649/?tab=2&navtag=%2Fajax%2Fmodfiles%2F%3Fid%3D38649&pUp=1 Safety load http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1, Did you try playing after uninstalling UFO? There is a torchbug in Riverrun in front of sawmill that you use to do a clean uninstall.

Disable crimson tide, DeadlySpell Impacts and use this mod http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1. You should also use optmized HD textures from here rather than vanilla HD http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1 and http://skyrim.nexusmods.com/mods/38649/?tab=2&navtag=%2Fajax%2Fmodfiles%2F%3Fid%3D38649&pUp=1 this makes it more stable.

Can you post your mod load order?

Run Tes5 Edit and then sort out your load order you might be overriding the mod because of that.

http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1

also try this. http://skyrim.nexusmods.com/mods/46465/?tab=4&navtag=%2Fajax%2Fcomments%2F%3Fmod_id%3D46465%26page%3D1%26sort%3DDESC%26pid%3D0%26thread_id%3D1200047&pUp=1

Disable Open cities skyrim mod. Download and run tes 5 edit, if no errors than download wrye bash and make a merged patch and put it last in your load order. Run tes5 edit again. Make a new save and try.

Put bashed patch last of your load order and Try Disabling ETAC.