diff --git a/poc b/poc
index 64031bd..84e502b 100755
--- a/poc
+++ b/poc
@@ -16,12 +16,15 @@ function is_true {
 # example:
 #   alias toto="bash -c \"[[ \\\$MIAOU_DEBUG == 'true' ]] && echo yes \\\$* || echo nope\""
 function miaou_debug {
-  is_true "${MIAOU_DEBUG}" && >/dev/tty builtin echo -e "\r\e[90mDEBUG <==> \e[95m$*\e[0m" || true
+  is_true "${MIAOU_DEBUG}" && >/dev/tty builtin echo -e "\e[90mDEBUG <==> \e[33m$*\e[0m" || true
 }
 
 function on_error {
+  >/dev/tty printf '\r' # force carriage return explicitly
+
   code="${1:-100}"
   miaou_debug "on_error: $code ($$ -- $BASHPID)"
+
   if [[ $$ == "$BASHPID" ]]; then
     >&2 echo "${BASH_SOURCE[1]}: line ${BASH_LINENO[0]}: command_error: ${code}"
     failure_type="COMMAND_ERROR"
@@ -33,19 +36,34 @@ function on_error {
 }
 
 function dump_stderr {
-  >&2 printf '' # force flush
-
   miaou_debug --stderr--
   mapfile -t tmp_error <"$MIAOU_BASH_ERROR"
-  for i in "${tmp_error[@]}"; do >&4 echo -e "$i"; done
+  for i in "${tmp_error[@]}"; do
+    echo -e "$i"
+  done
   miaou_debug --end of stderr--
 }
 
+function dump_failure {
+  miaou_debug --error box--
+  echo FAILURE: "$failure_type"
+  miaou_debug --end of error box--
+}
+
+function dump_stacktrace {
+  miaou_debug --stacktrace--
+  echo stacktrace...
+  miaou_debug --end of stacktrace--
+}
+
 function on_exit {
   code="${1:-0}"
   failure_type="${failure_type:-UNDEFINED}"
 
-  dump_stderr
+  2>&3 >&3 dump_stderr
+  2>&3 >&3 dump_failure
+  2>&3 >&3 dump_stacktrace
+
   miaou_debug "on_exit $code $failure_type"
 }
 
@@ -73,6 +91,7 @@ trap 'on_exit $?' EXIT
 trap 'on_pipe' PIPE
 
 echo "--SOURCE scenario ${BASHPID}"
-exec 3> >(tee "$MIAOU_BASH_ERROR" >/dev/null) 4>/dev/stderr
-source ./test/stub/scenario.bash subshell_term 2>&3
+exec 3>/dev/stderr
+2>"$MIAOU_BASH_ERROR" source ./test/stub/scenario.bash subshell_term
+exec 3>-
 echo "--SUCCESS scenario"
diff --git a/test/stub/scenario.bash b/test/stub/scenario.bash
index 788109c..17ced1e 100755
--- a/test/stub/scenario.bash
+++ b/test/stub/scenario.bash
@@ -14,15 +14,17 @@ function do_subshell_false {
 
 function do_subshell_term {
 
-  echo -n toto est fluo
-  >&2 echo -n 'error in transla...'
+  echo first line.
+  # echo -n second line...
+  # >&2 echo stderr1
+  # grep none none 2>/dev/null
   # echo 'toto' | grep none
   # echo 'toto' | return 3
 
   echo -n "found1=$(grep nope nope)"
-  echo "found1=$(grep nope nope | grep none)"
-  echo "found2=$(command_not_found)"
-  echo SHOULD NOT SHOW UP!
+  # echo "found1=$(grep nope nope | grep none)"
+  # echo "found2=$(command_not_found)"
+  # echo SHOULD NOT SHOW UP!
 }
 
 function do_last_false {