diff --git a/server/gameserver/obstacle.cc b/server/gameserver/obstacle.cc
index da09273..2afd667 100644
--- a/server/gameserver/obstacle.cc
+++ b/server/gameserver/obstacle.cc
@@ -304,7 +304,7 @@ void Obstacle::Explosion(Bullet* bullet)
             case ET_Player:
                 {
                     Human* hum = (Human*)target;
-                    if (!hum->dead) {
+                    if (!hum->dead && hum->team_id != team_id_) {
                         float dmg = meta->i->damage();
                         float def = hum->ability.def;
                         float finaly_dmg = dmg * (1 - def/MetaMgr::Instance()->K);
diff --git a/server/gameserver/player.cc b/server/gameserver/player.cc
index a99dea4..b900bf5 100644
--- a/server/gameserver/player.cc
+++ b/server/gameserver/player.cc
@@ -184,7 +184,8 @@ void Player::UpdateShot()
     if (dead ||
         downed ||
         room->IsWaitingStart() ||
-        HasBuffEffect(kBET_Jump)) {
+        HasBuffEffect(kBET_Jump) ||
+        HasBuffEffect(kBET_Fly)) {
         shot_start = false;
         shot_hold = false;
         series_shot_frames = 0;
diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index ff54bbe..33c7ce7 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -384,7 +384,7 @@ void RoomObstacle::ActiveMine()
 {
     room->xtimer.AddRepeatTimerAndAttach
         (
-         SERVER_FRAME_RATE,
+         1,
          a8::XParams()
          .SetSender(this),
          [] (const a8::XParams& param)