Fix water striders behaviour

Water striders can't walk on land and attack slower

data/json/monsters/insect_spider.json

@@ -1861,8 +1861,8 @@
   {
     "id": "mon_aphid",
     "type": "MONSTER",
-    "name": { "str": "giant aphid", "str_pl": "giant aphids" },
-    "description": "A green aphid about a size of a rabbit.  It is constantly searching for plants to suck from.",
+    "name": { "str": "giant aphid" },
+    "description": "A green aphid about the size of a rabbit.  It is constantly searching for plants to suck from.",
     "default_faction": "ant",
     "bodytype": "insect",
     "species": [ "INSECT" ],
@@ -1909,7 +1909,7 @@
   {
     "id": "mon_mantis_giant",
     "type": "MONSTER",
-    "name": { "str": "giant praying mantis", "str_pl": "giant praying mantises" },
+    "name": { "str": "giant praying mantis" },
     "description": "An enormous green creature grown about a size of a bear.  It dances weirdly and ready to chop your head off in any moment.",
     "default_faction": "mantis",
     "bodytype": "insect",
@@ -1943,7 +1943,7 @@
   {
     "id": "mon_mantis_mega",
     "type": "MONSTER",
-    "name": { "str": "great mantis", "str_pl": "great mantises" },
+    "name": { "str": "great mantis" },
     "description": "This ferocious creature is lurking through the land.  It's probably capable of killing a moose with it's powerful arms.",
     "copy-from": "mon_mantis_giant",
     "proportional": { "hp": 20, "speed": 0.25, "vision_day": 2 },
@@ -2055,7 +2055,7 @@
   {
     "id": "mon_grasshopper_giant",
     "type": "MONSTER",
-    "name": { "str": "giant grasshopper", "str_pl": "giant grasshoppers" },
+    "name": { "str": "giant grasshopper" },
     "description": "A huge green grasshopper about a size of a big dog with long and strong back legs.  It hops, it hops and never stops.",
     "default_faction": "insect",
     "bodytype": "insect",
@@ -2087,7 +2087,7 @@
   {
     "id": "mon_antlion_larva",
     "type": "MONSTER",
-    "name": { "str": "giant antlion larva", "str_pl": "giant antlion larvae" },
+    "name": { "str": "giant antlion larva" },
     "description": "This huge grub has powerful mandibles and a hungry look.  It hides in dirt and waits for pray to come clother.",
     "default_faction": "antlion",
     "bodytype": "insect",
@@ -2167,7 +2167,7 @@
     "volume": "3 L",
     "weight": "4 kg",
     "melee_cut": 8,
-    "upgrades": { "half_life": 14, "into": "mon_mantis_giant" }
+    "upgrades": { "half_life": 14, "into": "mon_strider_giant" }
   },
   {
     "id": "mon_strider_giant",
@@ -2181,6 +2181,7 @@
     "weight": "12 kg",
     "hp": 20,
     "speed": 200,
+    "attack_cost": 200,
     "material": [ "iflesh" ],
     "symbol": "s",
     "color": "light_gray",
@@ -2200,6 +2201,6 @@
     "anger_triggers": [ "PLAYER_WEAK" ],
     "fear_triggers": [ "FIRE",  "PLAYER_CLOSE"],
     "death_function": [ "NORMAL" ],
-    "flags": ["POISON", "SEES", "HEARS", "SMELLS", "SWIMS" ]
+    "flags": ["POISON", "SEES", "HEARS", "SMELLS", "SWIMS", "AQUATIC" ]
   }
 ]