If i remember correctly there is a pattern to Belial's attacks (after numerous death on my 1st char lolz).
1- single hand slam (left @ right) if u look closely there will be green circle on the ground marking the location he will slam his fist (i think this answers your question) - try to get as far away from that green circle spot.
2- his sweeping acid breath: attacking left to right or vice versa - this one is the easiest to avoid by going to farthest corner
3 - his double slam attack where acid rain will pour down on many places (also noted by green circles) - this by far is the hardest to avoid unless using chars that have temporary invulnerability such as DH's SS @ even Vault, WD's SW (Wiz maybe can teleport i nvr try & Barb maybe leap)

Belial remains the only act boss i never farm haha.

This post has been edited by Gecko: Nov 3 2012, 08:09 PM